To leave something alone; to avoid trying to correct, fix, or improve what is already adequate.

(idiomatic) Something so distressing that it causes one to lose hope and faith.

(idiomatic) To allow one to function unhindered, or without further overbearing oversight.

(idiomatic) Synonym of close enough for government work

(US, idiomatic, humorous, derogatory) Adequate: acceptable as government work, imperfect but not worth the time or effort of improving.

(informal) Very little space (available) (of a very small room).

(Ireland, humorous) Of tea: made very strong.

Synonym of leave well enough alone

(colloquial) furiously angry

That which is very outlandish or outrageous.