be/go out like a light

informal

to go to sleep very quickly.

I was out like a light after all that fresh air.

• on the agenda
• on the air
• on the attack
• on the average
• on the back burner
• on the ball
• on the bench
• on the blink
• on the block
• on the blocks
• on the boil
• on the books
• on the brink of
• on the brink of something
• on the bubble
• on the button
• on the case
• on the cheap
• on the contrary
• on the cutting edge
• on the cutting edge of
• on the cutting edge of something
• on the cutting room floor
• on the dot
• on the double