key down
(使) 心情輕鬆；放鬆心情
I need to key down before I go to bed.
key * in +
鍵入，輸入 (數字、資料等)
It took me ages to key in all the information into the database.
key in on +
把注意力集中在；挑出，選出
They keyed in on the person they believed had done it.
key on +
(運動用語) 鎖定，對準...下手
We will key on the opposing team's lack of skills on defense.
key to +
改變...以適應 (某種需要) － 通常用被動態
Promotions are keyed to people's abilities.
key * up +
使激動、興奮或緊張
The noise got us keyed up.
本文亦刊載在下列網址：
http://htmfiles.englishhome.org/phrasalverbs/phrasalverbs-k.htm