Английский словарь американских идиом - let well enough alone

or leave well enough alone {v. phr.} To be satisfied with what is good enough; not try to improve something because often that might cause more trouble. * /John wanted to make his kite go higher, but his father told him to let well enough alone because it was too windy./ * /Ed polished up his car until his friends warned him to leave well enough alone./ * /Ethel made a lot of changes in her test paper after she finished. She should have let well enough alone, because she made several new mistakes./ Compare: LET RIDE.