The land is ruined, its falcon has tucked its head under its feathers. خربان أرض صقرها ملت

خربان أرض صقرها ملت
الخرب، ذكر الحباري والجمع خربان. وألت الصقر، إذا أدخل رأسه تحت ريشه يضرب لقوم يعيشون في أرض غفل صاحبها عنهم.
------------------------------------------------------------------------------------
The land is ruined, its falcon has tucked its head under its feathers.
The word "kharb" refers to the male bustard, and its plural is "kharbān." The phrase "the falcon has tucked its head under its feathers" is used to describe a people living in a land neglected by its owner.
-----------------------------------------------------------------------------
المثل العربي «خِرْبانُ أرضٍ صَقْرُها مُلِتّ» يُضرب لقوم يعيشون آمنين أو ينتفعون بمكان لأن صاحبه أو حاميه غافل عنهم. فالصقر، وهو المفترس، قد أدخل رأسه تحت ريشه (أَلَتَّ)، فاغتنمت الخِرْبانُ (ذكور الحبارى) غفلته.
ولا يوجد مثل إنجليزي مطابق تمامًا، لكن أقرب المقابلات هي:
When the cat's away, the mice will play.
«إذا غاب القط لعبت الفئران.»
وهو أشهر مقابل، ويقال عندما يغيب الرقيب أو صاحب السلطة، فيتصرف الآخرون بحرية.
Opportunity makes the thief.
«الفرصة تصنع اللص.»
أي إن غياب الرقابة يشجع على الاستفادة أو التعدي.
While the shepherd sleeps, the wolf catches sheep.
«حين ينام الراعي، يفترس الذئب الغنم.»
وهو تعبير شائع يبرز أثر غفلة الحارس، وإن كان أقل شهرة من الأول.
أفضل مقابل
إذا كان المقصود هو انتفاع الناس أو تجرؤهم بسبب غفلة صاحب الأمر، فإن أفضل مقابل إنجليزي هو:
"When the cat's away, the mice will play."
لأنه ينقل الفكرة نفسها: غياب الرقيب أو غفلته يتيح للآخرين أن يفعلوا ما يشاؤون.
-------------------------------------------------------------------------------------------------------------
The Arabic proverb "The vultures of a land whose falcon is tucked away" is used to describe a people who live safely or benefit from a place because its owner or protector is unaware of their presence. The falcon, the predator, has tucked its head under its feathers (tucked away), and the vultures (male bustards) take advantage of its inattention.
There is no exact English proverb, but the closest equivalents are:
When the cat's away, the mice will play.
This is the most common equivalent, and it is said when the supervisor or authority figure is absent, and others act with impunity.
Opportunity makes the thief.
This means that the absence of supervision encourages exploitation or transgression.
While the shepherd sleeps, the wolf catches sheep.
When the shepherd sleeps, the wolf preys on the sheep. This is a common expression highlighting the effect of a careless guardian, though it is less well-known than the first.
Best equivalent
If the intention is to describe people taking advantage of or becoming emboldened by the carelessness of the person in charge, the best English equivalent is:
"When the cat's away, the mice will play."
Because it conveys the same idea: the absence or carelessness of the supervisor allows others to do as they please.

.Leave the shortcuts to the cunning thief. دَعِ المَعَاجِيلَ لِطِمْلٍ أَرْجَلَ

"Ma'ajil" is the plural of "ma'jal," which means a shortcut to houses and water sources, as if it were too quick to be fully laid out. "Timl" refers to a cunning thief, and "arjal" means someone with strong, sturdy feet who hardly ever wears out.
This proverb is used to advise staying away from places of suspicion, meaning to leave them to those who are suspected.
-----------------------------------------------------------------------------------------------------------
The proverb "Leave the hasty ones to the one with the long legs" means: Stay away from dubious paths and suspicious means, leave them to those who engage in them, and avoid places of accusation and suspicion.
The closest English proverbs to this meaning are:
If you lie down with dogs, you get up with fleas.
— Meaning that associating with bad people or following their ways brings harm and accusations.
Avoid the appearance of evil.
— This is closest in meaning to staying away from places of accusation.
Keep out of harm's way.
Stay away from danger.
Stay away from trouble.
Don't play with fire.
— Meaning, don't expose yourself to what will bring you harm.
----------------------------------------------------------------------------------------------
 
المعاجيل: جمع مَعْجَل، وهو الطريق المختصر إلى المنازل والمياهِ، كأنه أعجل عن أن يكون مبسوطا، والطِّمْل: اللص الخبيث، والأرْجَلُ: الصلب الرِّجْل الذي لا يكاد يَحْفَى.
يضرب في التباعد عن مواضع التُّهَمِ، أي دعها لأصحابها.

folan was struck by folans head. رمي فلان من فلان في الرأس.

If he turned away from him and his opinion of him became so bad that he wouldn't even look at him.
Abu Ubayd said: From this comes the hadith of Umar ibn al-Khattab, may God be pleased with him, when Ziyad ibn Hudhair greeted him and he did not return the greeting. Ziyad said: "I have been struck by the Commander of the Faithful's head." This was due to an appearance he saw in him that he disliked. Ziyad meant: "The Commander of the Faithful has a bad opinion of me." So, if it is said, "So-and-so was struck by so-and-so's head," the implied meaning is: "Something of him was thrown into his head," meaning something was instilled in his mind that caused him to have a bad opinion of him. The definite article in their saying "in the head" stands in for the possessive pronoun, as in the saying: "And our noses are between the beards and the eyebrows."

--------------------------------------------------------------------------------------------------------------

 The closest equivalent in English is:
He fell out of favor.
Meaning: He lost his friend's favor or standing.
A very similar expression is:
He got on his bad side.
Meaning: He became the object of his friend's displeasure and ill opinion.
Similarly:
He wouldn't even look at him.
This is close to explaining the proverb: "His opinion of him became so bad that he turned away from him and wouldn't even look at him."
Another proverb with a similar meaning is:
A cloud came between them.
Meaning: Discord or mistrust arose between them and ruined their relationship.

---------------------------------------------------------------------------------------------------

إذا أعرض عنه وساء رأيه فيه حتى لا ينظر إليه
قال أبو عبيد: ومنه حديث عمر بن الخطاب رضي الله تعالى عنه حين سلم عليه زياد بن حذير فلم يرد عليه، فقال زياد: لقد رميت من أمير المؤمنين في الرأس، وكان -[288]- ذلك لهيئة رآها عليه فكرهها، وأراد زياد لقد ساء رأي أمير المؤمنين في، فإذا قيل "رمي فلان من فلان في الرأس" كان التقدير: رمى في رأسه منه شيء، أي ألقى في دماغه منه وسوسة حتى ساء رأيه فيه، والألف واللام من قولهم "في الرأس" ينوبان عن الإضافة كقوله: وآنفنا بين اللحى والحواجب