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.
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How to use if it ain't broke don't fix it in a sentence
The gunman hardly broke stride as he nonetheless shot Merabet in the head, killing him.
Further, there are maintenance crews who have to fix those drones.Exclusive: U.S. Drone Fleet at ‘Breaking Point,’ Air Force Says|Dave Majumdar|January 5, 2015|DAILY BEAST
“We broke off shortly after because we were more ambitious,” says Lean.The Cult of Yung Lean: ‘I’m Building An Anarchistic Society From the Ground Up’|Marlow Stern|January 4, 2015|DAILY BEAST
Her slight miscalculation of how to fix the situation leads to her driving around the gas pump.Slow Motion Tiger Jump, a Tornado at the Rose Bowl and More Viral Videos|The Daily Beast Video|January 4, 2015|DAILY BEAST
Marvin takes off his T-shirt and dives into his swimming pool.The Story Behind Lee Marvin’s Liberty Valance Smile|Robert Ward|January 3, 2015|DAILY BEAST
The volcanic eruptions of the mountains on the west broke down its barriers, and let its waters flow.
The great plague of this and the subsequent year broke out at St. Giles, London.The Every Day Book of History and Chronology|Joel Munsell
The Senora Moreno's heart broke within her, when those words passed her lips to her adored Felipe.Ramona|Helen Hunt Jackson
There'll be heaps uh fun in the Cypress Hills country when they get t' runnin' the whisky-jacks out.Raw Gold|Bertrand W. Sinclair
A sob rose in her throat, and broke from her lips transformed into a trembling, sharp, glad cry.The Bondboy|George W. (George Washington) Ogden