1 (in past times) a large piece of metal or wood that soldiers carried to protect themselves （旧时）盾，盾牌

2 riot shield a piece of equipment made of strong plastic, that the police use to protect themselves from angry crowds 防暴盾牌

3 a person or thing that is used to protect sb/sth especially by forming a barrier 防御物；屏障: The metal door acted as a shield against the explosion. 那道金属门挡住了爆炸的威力。

4 an object or drawing in the shape of a shield, sometimes used as a prize in a sports competition 盾形对象，盾形纹徽（有时用作体育比赛的奖品） ☞picture at medal 见medal插图