let something slip

a little of something goes a long way

Only a small amount of something is usually required to produce a great effect.

buy to let

To purchase a property as in investment, and to let it out for rental instead of living in it

chalk something up to experience

To take a lesson from a bad outcome instead of grieving it.

don't let the door hit you on the way out

Used as a command to leave in haste, or to indicate that one is glad, or at least unmoved, to see the addressed person leaving.

get something over with

To proceed to do something as soon as possible, especially so as to have something unpleasant behind oneself.

give someone something to think about

To threaten or provide a challenge to.

give someone the slip

To evade, escape, or get away from somebody.

give something a go

To try or attempt.