let something ride
US /lɛt ˈsʌmθɪŋ raɪd/
UK /lɛt ˈsʌmθɪŋ raɪd/
1.
to allow a situation to continue without trying to change it, especially when it is bad or annoying
:
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I was annoyed by his comment, but I decided to let it ride.
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Sometimes it's better to just let things ride rather than cause a bigger argument.