1snipe 
/ˈsnaɪp/ verb
snipes; sniped; snip·ing /ˈsnaɪp/ verb 1 [no obj] : to shoot at someone from a hidden place
▪ Enemy fighters sniped at them from vacant buildings. 2 : to criticize someone or something in a harsh or unfair way [no obj] — usually + at ▪ The candidates have been sniping at each other in speeches. [+ obj] ▪ One of the senators sniped, “What does he think this is, a monarchy?”
▪ Enemy fighters sniped at them from vacant buildings.
— sniping noun [noncount]
▪ Soldiers took cover when the sniping started. ▪ There has been a lot of sniping between the candidates.
▪ Soldiers took cover when the sniping started. ▪ There has been a lot of sniping between the candidates.
