Gram. 1. Also called tag. a short interrogative structure appended to a statement or command, as isn't it in It's raining, isn't it?, are you in You're not going, are you?, or German nicht wahr. 2. a question formed by appending such a structure to a declarative sentence or command, often inviting confirmation or assent, as She lives nearby, doesn't she? or Sit down, won't you?