We found one dictionary that defines the word feel someone's collar:

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1. feel someone's collar: Wiktionary

Definitions from Wiktionary (feel someone's collar) ▸ verb:  (British, informal) To arrest someone. ▸ Words similar to feel someone's collar ▸ Usage examples for feel someone's collar ▸ Idioms related to feel someone's collar ▸ Wikipedia articles (New!) ▸ Words that often appear near feel someone's collar ▸ Rhymes of feel someone's collar ▸ Invented words related to feel someone's collar