let sleeping dogs lie

buy to let

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

call off the dogs

To ease up on after inflicting great punishment.

dogs bark, cats meow

Used to introduce something seen as inevitable or totally commonplace.

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.

give the lie

To respond to an insult, accusation, or falsehood by saying the offender is lying, particularly in the context of provoking a challenge to a duel.

give the lie to

To reveal or prove (something) to be false; to refute.

go to the dogs

To decline or deteriorate shockingly.

I can't lie

To be honest, frankly, honestly.