A diamond in the rough
A drop in the bucket
A frog in one’s throat
A piece of cake
A shot in the dark
Achilles’ heel
An arm and a leg
An eye for an eye
Apple of your eye
Armed to the teeth
As cool as a cucumber
At the drop the a hat
At the eleventh hour
Back to square one
Backseat driver
Ballpark figure
Balls in your court
Beat around the bush
Behind the eight ball
Better half．
Big wig
Bite ones lip
Bite the bullet
Black sheep
Blessing in disguise
Bom yesterday
Break a leg
Bum the midnight oil
Bury head in the sand
Butter up
Catch some Zs
Catch-22
Chew the fat
Chicken feed
Chip offthe old block
Close， but no cigar
Cry in ones beer
Double whammy
Down for the count
Eagle eye
Eat ones hat
Eat ones heart out
Eat ones words
Egg on ones face
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