key into

Verb

 * 1)  To put (someone) into (a particular state, emotion etc.).
 * 2)  To cohere with; to accord with, to be in keeping with.
 * 3)  To make (someone) focus or concentrate on (something); to make (someone) understand.
 * Walter wasn't on the same page as the rest of us at first, but we talked about it and keyed him into it.
 * Walter wasn't on the same page as the rest of us at first, but we talked about it and keyed him into it.