Meaning of “pick sb up on sth” in the English Dictionary

british dictionary

"pick sb up on sth" in British English

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pick sb up on sth

phrasal verb with pick uk /pɪk/ us /pɪk/ verb

to criticize someone about something they have said:

"I want to pick you up on the point you made a few minutes ago about personal morality, Archbishop."
His teacher picked him up on his pronunciation.

(Definition of “pick sb up on sth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)