key down; key in; key in on; key on; key to; key up

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 +
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 +
The noise got us keyed up.