key to
phrasal verb
keyed to;
keying to;
keys to
Definition of key to
chiefly US
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.