a hot potato

a penny for your thoughts

actions speak louder than words

add insult to injury

an arm and a leg

at the drop of a hat

back to the drawing board

ball is in your court

barking up the wrong tree

beat around the bush

best of both worlds

best thing since sliced bread

burn the midnight oil

cross that bridge when you come to it

cry over spilt milk

cut corners

hear it on the grapevine

hit the nail on the head

jump on the bandwagon

kill two birds with one stone

piece of cake

sit on the fence

steal someone's thunder

take sth. with a grain of salt

the whole nine yards