丢盔弃甲弃（卸）diū kuī qì jiǎ

盔：打仗时用来保护头部的帽子，一般多用金属制成；弃：扔下；甲：古代作战时，用皮革或金属制成的护身服。形容打败仗后狼狈逃窜的情形，连盔甲兵器都扔掉了。throw away everything in headlong flight, fly pell-mell, throw down one’s arms run like sheep, throw away one’s shield and armour