niggle about

niggle about (someone or something)

To make petty, trivial, or minor complaints about someone or something. The couple at table 22 has been niggling about their meal since the moment they sat down. Tom's always niggling about his boss, but I know he'll never stand up to her.
See also: niggle
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

niggle about something

to make constant petty complaints about something. Please don't niggle about little things like this. This is just not important. Let's not niggle about it.
See also: niggle
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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