Definition of check in withUS, informal
- I have to go to a meeting now, but I'll check in with you later.
: exposure of a chess king to an attack from which he must be protected or moved to safety
: a sudden stoppage of a forward course or progress : arrest
: a checking of an opposing player (as in ice hockey)
: to put (a chess king) in check
: rebuke, reprimand
: to slow or bring to a stop : brake
used to express assent or agreement
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