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Phrase(s): snipe at someone or something
1. Lit. to fire a weapon at someone or something from a concealed position. • Someone with a rif le sniped at the troops as they went through the jungle. • A rif leman was busy sniping at the platoon. 2. Fig. to make petty complaints attacking someone or something. • Stop sniping at me and everything I do. • Ken is always sniping at my reports.
McGrawhill's American Idioms And Phrasal Verbs