to shoot at someone from a position where you cannot be seen打冷枪;狙击
The rebels have started sniping at civilians.反叛者开始狙击平民。
to criticize someone unpleasantly诽谤,恶意攻击
The former minister has been making himself unpopular recently, sniping at his ex-colleagues.最近这位前部长因恶意攻击以前的同事而大失人心。