Idioms

Best thing since slide bread: is a good idea or plan
Barking up the wrong tree: you're looking in the wrong plce
Costs and arm and a leg it's used when someting is very expensive
Cry over spilt milk: to cry because of something you cannot change
Devils advocate: ser abogado del diablo
Elvis has left the building: th party is finished
Don't count your eggs before they hatched: no contar con ago antes de tenerlo seguro