Expressions (phrases, clauses, etc.), Ichidan verb
to pounce on someone's words; to cavil at someone's words; to trip someone up with their own words
すぐ人の言葉尻を捕らえて非難するよな。Quick to pounce on what people say and pick on them.
Also written 言葉尻をとらえる【ことばじりをとらえる】、言葉尻を捕らえる【ことばじりをとらえる】