No. Persecute and detain are not antonyms or synonyms.
yes
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in the judicial/ law enforcement meaning of detain, the antonym is " to release"
Accuse, blame, convict, persecute, etc.
I will detain your bike. Police can not detain my car.
I'll detain you no further.
We won't detain you any further. Find a way to detain him until I get there.
The correct spelling of "detain" is D-E-T-A-I-N.
The dictator intended to persecute those who spoke out against his regime. The word persecute is a verb, and a synonym is torment.
Please don't detain me, I am already late.
Persecute IS a verb
Must you persecute my people? Perhaps you would prefer to persecute someone else? Never mind the prosecution, the press will take every chance to persecute me!