key into
verb1
To put (someone) into (a particular state, emotion etc.).
2
To cohere with; to accord with, to be in keeping with.
- [T]he sheer insistence here on these myths of Greek victory, and the repeated variations on the theme through different legendary cycles, key into the idea of the Parthenon as a monument of Athenian triumph.2002, Mary Beard, The Parthenon, Profile Books, published 2010, page 144:
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.