Definitions of check up on
examine so as to determine accuracy, quality, or condition
check, check into, check out, check over, go over, look into, suss out
check, check off, mark, mark off, tick, tick off
put a check mark on or near or next to
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follow, keep an eye on, observe, watch, watch over
follow with the eyes or the mind
keep tabs on
keep a record on or watch attentively
keep watch over
watch over (students taking an exam, to prevent cheating)
analyse, analyze, canvas, canvass, delve, examine, parse, study
consider in detail and subject to an analysis in order to discover essential features or meaning