[jakub.golovkin@gmail.com]

As Cool As A Cucumber- very calm
Bob’s Your Uncle- as simple as that
Dead As A Doornail- completely dead
For donkey’s years- If you have done something for donkey’s years, then you have done it for an awfully long time without any change or much to show for it.

[paulinagorska]

Do a runner - to leave a place in a hurry in order to avoid paying for something or flee a difficult situation to escape punishment
Hairy at the heel - used by the British upper-crust to refer to someone who is ill-bred, dangerous or untrustworthy
All talk and no trousers - Someone who says a lot about doing big, important things, but doesn’t actually take any action.

[wierzba1195]

hold your horses - wait a moment
kick the bucket - to die
blue in the face - weakened or tired after trying many times
a storm in a teacup - a big fuss made about something of little importance

[PatrycjaW]

pardon my French - an informal apology for the use of profane or swear words

i moje ulubione:

when pigs fly - zobaczysz jak świnia niebo

[rita.ki95]

- nitty-gritty - the heart of a matter
- mumbo jumbo - sth that is hard to understand
- be pretty wet behind the ears - "żółtodziób", mieć mleko pod nosem

[jgajdamo]

Cat got your tongue - Used to compel someone to speak or to point out their silence when they're being unusually taciturn
Chew the fat - To gossip or make friendly small talk. A bit old-fashioned
Under the weather- To feel ill or tired
To go pear-shaped - Describing something that has gone wrong
My neck of the woods - The area where I live

[wkowalik]

Head in the clouds - living in the fantasy
A piece of cake - sth very easy to do
Hairy at the heel - someone who is ill-bred, dangerous or untrustworthy
All talk and no trousers - Someone who is all talk and no trouser talks and thumps his chest a lot about doing big, important things, but doesn’t actually take any action.

[GosiaS1993]

throw a spanner in the works - to do something that complicates a plan or prevents it from succeeding
a different kettle of fish - Referring to an alternative thing altogether
damp squib - Something that fails to meet expectations, an anti-climax

[pkostorz]

Have one's heart in one's mouth - mieć serce w gardle
Pardon my French - przepraszam za przekleństwa
Have a one track mind - myśleć jednotorowo

[ania0207]

You have ants in your pants-
nie móc usiedzieć na miejscu
Fat cat- gruba ryba
The world is your oyster-
Świat stoi przed nami otworem