## 703. Keep someone at arm's length

## 704. Keep something at bay

## 705. Keep something under one's hat

## 706. Keep the ball rolling

## 707. Keep up with

## 708. Keep you posted

## 709. Keep your chin up

## 710. Keep your head

## 711. Keep your mouth shut

## 712. Keep your nose clean

## 713. Keep your wits about you

## 714. Keeping up with the Joneses

## 715. Kept in the dark

## 716. Keyed up

## 717. Kick up your heels

## 718. Kill the mood

## 719. Kill two birds with one stone

## 720. Kit and caboodle

## 721. Knee-high to a grasshopper

## 722. Knee-jerk reaction