This is because when a hyena sees a rider, it runs away from him and takes another direction, just as a wolf opposes a rider. This proverb is used to describe someone who goes against the norm, and the word "opposes" here is in the accusative case, meaning "you are the opposite of a hyena."
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The closest English equivalents in meaning:
To go against the grain: meaning to go against the norm or what people do.
To be contrary: meaning someone who is stubborn and likes to disagree.
He always swims against the tide: meaning he always swims against the current.
This is one of the closest to the Arabic proverb.
Just to be difficult: meaning he disagrees simply for the sake of disagreeing.
A contrarian: describing someone who always adopts the opposing viewpoint.
The closest figurative expression to the proverb:
He always goes the opposite way.
Or:
He swims against the tide.
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وذلك، أن الضبع إذا رأت راكباً خالفته وأخذت في ناحية أخرى هرباً منه والذئب يعارضه مضادة للضبع. يضرب، لمن يخالف الناس فيما يصنعون، ونصب خلاف على المصدر أي تخالف خلاف الضبع.
