key tophrasal verb
keyed to; keying to; keys to
Definition of key to
1 : to make (something) suitable for (a particular use or type of person) I try to key my lectures to my audience. —often used as (be) keyed to The educational program is keyed to the needs of working women.
2 : to change (something) in a way that is closely related to (something else) —usually used as (be) keyed to The amount of money they receive is keyed to the rate of inflation.
to mark by some ceremony or observation
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