In a small group of people, the leader singled out Person A to pick on her. What's another idiom (that's a verb) to describe this action? There was a two-word idiom which I cannot remember. The idiom is used as thus: "The leader ___'d person A ____.
Your example makes me think of the phrasal verb, "Call out".
vb (adverb) 1. to utter aloud, esp loudly
- (tr) to summon
- (Industrial Relations & HR Terms) (tr) to order (workers) to strike
- (Industrial Relations & HR Terms) (tr) to summon (an employee) to work at a time outside his normal working hours, usually in an emergency
- (tr) to challenge to a duel
Collins English Dictionary – Complete and Unabridged © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003
There are more than a few (mostly of a vernacular nature):
To scold or reprimand someone
to chastise someone severely
The idioms by themselves do not convey the public nature of the singling out. I personally prefer to use public execution, after the practice of executing criminals in full view of public. I don't think that's a standard use of the phrase, but I use it in that sense