take note of
take note of or take notice of {v. phr.}
1. To look carefully at; pay close attention to; observe well.
A detective is trained to take note of people and things.
2. To notice and act in response; pay attention.
Two boys were talking together in the back of the room but the teacher took no notice of them.
The principal thanked everyone who helped in the program, and took note of the decorations made by the art class.
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Source: A Dictionary of American Idioms
