Food
a piece of cake
something easily achieved/done
raining cats and dogs
raining very hard
couch potato
someone who rarely exercises, and often watches TV
hold your horses
slow down, wait a moment, or be patient
don't cry over spilled milk
It's no use crying over something that has already happened and can't be changed
cry wolf
saying there is a problem when there isn't, so when there really is a problem, no one believes you
don't put all your eggs in one basket
don't put all of your efforts or resources in to one area, as you could lose everything if it doesn't work out
curiosity killed the cat
being inquisitive about another's affairs may get you in to trouble
icing on the cake
an extra good thing that makes a good situation or activity even better
let the cat out of the bag