niggle
/ˈnɪgl; `nɪɡl/ v
1 [I, Ipr] ~ (about/over sth) give too much time and attention to unimportant details; criticize in a petty way 过分为琐事费时及操心; 挑剔
Stop niggling about every penny we spend. 别再为我们花的每个小钱费心思了.
2 [Tn] irritate (sb) in a minor way; annoy 惹（某人）不痛快; 惹恼
His untidiness constantly niggled her. 他邋邋遢遢总惹她讨厌.