Idioms

To learn by heart: to memorize
It's raining cats and dogs: it is pouring, raining too much
Out of the blue: suddenly, all of a sudden, from nothing
To be born with a silver spoon in your mouth: to be born in a wealthy family
To bury your head in the sand: to avoid the problems, not to face them ("esconder la cabeza bajo el ala")
The icing of the cake: the last event of a series of bad ones ("la guinda del pastel")
To put all your eggs in one basket: to put all your effort or resources into doing one thing so that, if it fails, you have no alternatives left.
... the rest is history: If you are telling someone about an event and say the rest is history, you mean that you do not need to tell them what happened next because everyone knows about it already. We met in college, the rest is history.
To sweeten the pill: to make some unpleasant news or an unpleasant measure more acceptable.
To eat humble pie: to make a humble apology and accept humilliation
To be on the cards: to be likely to happen
To be a big cheese: to be someone important
To be a couch potato: to be a person who takes little or no exercise and watches a lot of television.
To be a loose cannon: an unpredictable or uncontrolled person who can cause unintentional damage.
To be a rotten apple: used to refer to a morally corrupt person in a group, regarded as capable of having an adverse effect on others.
To be a tough cookie: a person who appears to be definiant for no good reason, although they likely have one and aren't telling you. They are masters of walking the line between displaying affection and acting like they don't care.
To be a wet blanket: a person who stops everybody when they are having fun
A leopard can't change it's spots: you cannot change who you are
Birds of a feather flock together: people who are similar tend to be together
Bark is worse than your bite: perro ladrador poco mordedor.
To call it a day: to end a relationship
To be on the rocks: to go through difficulties
A love - rat: a person who betrays their partner
To be an eager beaver: a person who is willing to work very hard
Like a bull in a china shop: If someone is like a bull in a china shop, they are very careless in the way that they move or behave
To go downhill: to gradually become worse
To sell like hot cakes: to be disposed of very quickly and effortlessly, especially in quantity
To spill the beans: to tell a secret
To take something with a pinch of salt: to not completely believe something that you are told, because you think it is unlikely to be true

IDIOMS

To learn by heart: to memorize

It's raining cats and dogs: it is pouring, raining too much

Out of the blue: suddenly, all of a sudden, from nothing

To be born with a silver spoon in your mouth: to be born in a wealthy family

To bury your head in the sand: to avoid the problems, not to face them ("esconder la cabeza bajo el ala")

The icing of the cake: the last event of a series of bad ones ("la guinda del pastel")

To put all your eggs in one basket: to put all your effort or resources into doing one thing so that, if it fails, you have no alternatives left.

... the rest is history: If you are telling someone about an event and say the rest is history, you mean that you do not need to tell them what happened next because everyone knows about it already. We met in college, the rest is history.

To sweeten the pill: to make some unpleasant news or an unpleasant measure more acceptable.

To eat humble pie: to make a humble apology and accept humilliation

To be on the cards: to be likely to happen

To be a big cheese: to be someone important

To be a couch potato: to be a person who takes little or no exercise and watches a lot of television.

To be a loose cannon: an unpredictable or uncontrolled person who can cause unintentional damage.

To be a rotten apple: used to refer to a morally corrupt person in a group, regarded as capable of having an adverse effect on others.

To be a tough cookie: a person who appears to be definiant for no good reason, although they likely have one and aren't telling you. They are masters of walking the line between displaying affection and acting like they don't care.

To be a wet blanket: a person who stops everybody when they are having fun

A leopard can't change it's spots: you cannot change who you are

Birds of a feather flock together: people who are similar tend to be together

Bark is worse than your bite: perro ladrador poco mordedor.

To call it a day: to end a relationship

To be on the rocks: to go through difficulties

A love - rat: a person who betrays their partner

To be an eager beaver: a person who is willing to work very hard

Like a bull in a china shop: If someone is like a bull in a china shop, they are very careless in the way that they move or behave

To go downhill: to gradually become worse

To sell like hot cakes: to be disposed of very quickly and effortlessly, especially in quantity

To spill the beans: to tell a secret

To take something with a pinch of salt: to not completely believe something that you are told, because you think it is unlikely to be true

​