noun
a slight feeling of annoyance or discomfort
verb
to criticize or complain about something in a petty way
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The constant niggle in my lower back has been bothering me for weeks.
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I have this annoying niggle in my phone that keeps freezing the screen.
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I can't stand that little niggle in my shoe, it's driving me crazy!
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There's always a niggle of doubt in the back of my mind whenever I make a big decision.