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What does "key" mean?

See in a sentence

In addition to the idiom beginning with key, also see in key; under lock and key.

See key in WNW Idioms

key in

to input (data) by means of a keyboard or keypad

key (in) on

to focus one's attention, effort, etc. on the teacher keyed in on the final chapter

key up

to make tense or excited, as in anticipation

See key in American Heritage Dictionary 4 Idioms

in key

In consonance with other factors.

out of key

Not in consonance with other factors.

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