It's better to have a glass of water as a chaser when drinking spirits.

chaser 是由动词 chase（追逐）加上名词后缀 -er 构成的名词。在饮酒场合中，chaser 特指"追饮的饮料"，即在喝完烈酒后紧接着饮用的饮料，用于缓解酒精的刺激感或稀释酒精度数。