niggle (with one) over (something)

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niggle (with one) over (something)

To fuss or argue (with one) over something petty, trivial, or unimportant. Look, I had a wonderful evening with you. Let's not ruin it by niggling over who pays what portion of the bill. We've been niggling with their lawyers about some of the finer points of the contract, but we still expect everything to be ready on time.
See also: niggle, over