keep cool

to keep calm

Example

It'll be OK, keep cool.

keep out of this!

Mind your own business!

Example

This has nothing to do with you. keep out of this!

Keep your shirt on!

Wait a moment. Be patient.

Example

It'll be ready on time. Just keep your shirt on!

keyed (up)

nervous, worried

Example

John's a bit keyed about the cuts at work.

kick the bucket

to die

Example

Our dog kicked the bucket last night.