His lice have crept in. دَبَّ قَمْلُهُ.

  دَبَّ قَمْلُهُ.
مثل يضرب للإنسان إذا سَمِن وحَسُن حالُه.
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His lice have crept in.
A proverb used to describe someone who has become wealthy and prosperous.
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المثل العربي «دَبَّ قَمْلُهُ» يُضرب لمن تحسنت حاله، وسمن، وظهرت عليه آثار الرخاء واليسر بعد ضيق أو فقر.
ومن أقرب المقابلات الإنجليزية: He's living high on the hog.
يعيش في رخاء ورفاهية. ← الأقرب مثلًا.
He's doing well for himself.
أصبح في حال جيدة وميسورة.
He's put on weight and prospered.
سمن وازدهرت أحواله.
He's come up in the world.
تحسنت مكانته وأحواله.
He's fat and happy.
أصبح سمينًا وراضيًا/مرتاح البال.
(تعبير دارج يشير إلى الرخاء والراحة).
وأقرب مثل إنجليزي يؤدي المعنى هو:
He's living high on the hog.
أما إذا أُريد التركيز على أن الرخاء ظهر على جسمه وهيئته، فالتعبير:
He's fat and happy.
هو الأقرب.
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The Arabic proverb "dabba qamluh" (his lice crept in) is used to describe someone whose circumstances have improved, who has gained weight, and who now shows signs of prosperity and ease after a period of hardship or poverty.
Some of the closest English equivalents are:
He's living high on the hog.
He lives in comfort and luxury.
He's doing well for himself.
He's become well-off and prosperous.
He's put on weight and prospered.
He's come up in the world.
He's become fat and happy.
(A common expression referring to prosperity and comfort).
The closest English proverb that conveys the meaning is:
He's living high on the hog.
However, if the emphasis is on the fact that the prosperity is evident in his physical appearance, the expression:
He's fat and happy.
This is the closest.