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3. if it ain't broke don't fix it

if it ain't broke don't fix it

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if it ain't broke don't fix it

Don't meddle with something that's functioning adequately. For example, So long as they like our proposal let's not change it; if it ain't broke don't fix it . This folksy and deliberately ungrammatical expression dates from the mid-1900s. For a synonym, see leave well enough alone.

See also: broke, fix, if