*meaning something interesting but complex which makes you think.
Spill the beans!
¡Suéltalo!
Be a fish out of water
Estar más perdido que un pulpo en un garaje
Get egg on your face
Quedar en ridículo
Have bigger fish to fry
Tener cosas más importantes que hacer
Be as cool as a cucumber
Estar fresco como una lechuga
Be in a pickle
Meterse en un lío
Act like a wet lettuce
Portarse como imbécil
Bring home the bacon
Ganarse el pan
Be cheesy
Ser cutre
Have a lot on your plate
Tener muchos asuntos pendientes
Put all your eggs in one basket
Poner todos tus huevos en la misma cesta
Don't count your chickens (before they've hatched)!
¡No vendas la piel del oso antes de cazarlo
It's no point crying over spilt milk
Llover sobre mojado
It's not my cup of tea
No es santo de mi devoción
Take something with a pinch of salt
Coger con pinzas
Be bread and butter
Ser de primera necesidad
Be a tough nut to crack
Ser un hueso difícil de roer
Be as cheap as chips
Ser una ganga
I bet that's whetted your appetite! Remember that there's no such thing as a free lunch, meaning there's no achievement without hard work. If you want to impress your English-speaking friends, you'll need to learn and practise using these idiomatic expressions.