have half an ear on (something)

to listen to something without giving it all your attention.

I had half an ear on the radio as he was talking to me.

• credit with something
• Crime doesn't pay.
• crock
• crock of shit
• crop up
• cross fingers
• cross has to bear
• cross mind
• Cross my heart.
• Cross my heart and hope to die.
• cross path
• cross someone has to bear
• cross someone's path
• cross swords
• cross swords with
• cross swords with someone
• cross that bridge when come to it
• cross that bridge when you come to it
• cross the line
• cross the Rubicon
• cross to bear
• cross your fingers
• cross your mind
• cross your path
• crowd-puller