[nig.gle] vb nig.gled ; nig.gling [origin unknown] vi (ca. 1616) 1 a: trifle b: to spend too much effort on minor details
2: to find fault constantly in a petty way: carp "she haggles, she ~s, she wears out our patience --Virginia Woolf"
3: gnaw ~ vt: to give stingily or in tiny portions -- nig.gler n
[2]niggle n (1886) chiefly Brit: a trifling doubt, objection, or complaint