大煞[杀]风景 [- shā fēnɡ jǐnɡ]do sth. to spoil sb.'s enthusiasm; throw [put] a wet blanket over [on]; dampen the spirit; disappointing; frustrating; spoil the fun; sink the spirits of; mar the pleasure of; spoil the pleasure：
•¶ 当我们正在举行野餐的时候， 忽然大雨倾盆， 实在是大煞[杀]风景。 We were having a picnic, when suddenly there came a downpour, which was rather a fly in the ointment.