don't hold your breath

and I don't mean maybe

Indicating that one is serious and not joking about a matter.

apron-string hold

An estate held by a man during his wife's life.

breath of fresh air

Something relieving, refreshing, or new.

buy and hold

A passive investment strategy where an investor purchases an asset and retains it for many years, rather than trading it frequently.

don't call me sir, I work for a living

Used by senior enlisted military personnel to indicate that they are not commissioned officers.

don't call us, we'll call you

A stereotypical statement from a hiring organization to a potential candidate, suggesting that the candidate will not be hired.

don't drop the soap

Used as a mockery to someone who is about to be or should be confined in prison.

don't get someone started

Used to attempt to avoid or abbreviate a discussion that speaker or hearer may wish to avoid.