動詞
無聲無色、出奇不意咁向敵人開槍 make a sneak attack using gun; fire a sniper's shot
美國總統約翰甘迺迪係被人放冷槍射死嘅。
美国总统约翰甘迺迪系被人放冷枪射死嘅。
US president John F.Kennedy was killed by a sniper's shot.
動詞
引伸指響人背後講壞話、暗中害人。近似放冷箭 figuratively, to secretly spread rumors or bad information of someone, in order to injure insidiously, to stab one in the back.
先排有人向佢放冷槍，爆晒佢貪污啲秘聞出嚟
先排有人向佢放冷枪，爆晒佢贪污啲秘闻出嚟
Someone has just fired a sniper's shot to him, all the bit and pieces about his corruption case is spreading around.
近義詞
放冷箭、狙擊
Examples (粵典–words.hk)
Cantonese
美国总统约翰甘迺迪系被人放冷枪射死嘅。
美國總統約翰甘迺迪係被人放冷槍射死嘅。
US president John F.Kennedy was killed by a sniper's shot.
Cantonese
先排有人向佢放冷枪，爆晒佢贪污啲秘闻出嚟
先排有人向佢放冷槍，爆晒佢貪污啲秘聞出嚟
Someone has just fired a sniper's shot to him, all the bit and pieces about his corruption case is spreading around.