Definition of key to phrasal verb from the Oxford Advanced Learner's Dictionary

 

key to

 phrasal verb
phrasal verb
 
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Phrasal Verbs

key somebody to something

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key something to something

 
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[usually passive] (especially North American English) to make somebody/something suitable or appropriate for a particular purpose synonym gear The classes are keyed to the needs of advanced students.
See the Oxford Advanced American Dictionary entry: key to