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take note (of somebody/something)
to give someone or something your attention take notice (of somebody/something) Travelers who plan to leave next week should take note that there may be an airlines strike.
Also, take notice. Pay attention, as in Take note, not one man here is wearing a tie, or The aide took notice of the boys throwing spitballs and reported them. An antonym is take no notice of, meaning "ignore," as in Take no notice of them and they'll stop teasing you. [Late 1500s] Also see take notes.