Name a common phrase which involves a bodypart?

[Spinneret]

Watching tv will give you square eyes

 

[tinkerjo]

Give me a hand!!!

 

[PrincessShmoo]

Head over heels in love.

 

[Neapolitan Ice Cream]

Break a leg!

 

[CAPSLOCK]

Put your foot in your mouth.
(2 body parts = bonus points?)

 

[dez1978]

Put your foot in your mouth.
(2 body parts = bonus points?)

Along with that "he's got his head up his behind" lol

 

[CAPSLOCK]

There's a buttload of phrases using "butt" or its synonyms.
Pain in the butt comes to mind.

Comes to mind is another....

 

[Cogswel_Cogs]

Watching tv will give you square eyes

Did you say common or uncommon
never heard this before

 

[anniemae]

Don't cut off your nose to spite your face

 

[TCRAIG]

Saying someone is a ‘pain in the neck…or lower’

 

[SleeplessInTO]

Talking your ear off.

 

[starry_solo]

It costs an arm and a leg
Also 2 body parts...

 

[FreckledOne]

If you don‘t stop bothering me, I‘m going to give you a knuckle sandwich.

 

[tinkerjo]

Making money hand over fist

 

[cayennews]

Get your head out of the sand.

 

[Kathryn Merteuil]

A bird in the hand is worth two in the bush???

 

[Cadiewampus]

You want your face to freeze that way?