When something rattles or when you rattle it, it makes short, sharp, knocking sounds because it is being shaken or it keeps hitting against something hard. 使发出嘎嘎声; 发出嘎嘎声
adjective [原级]担忧的;紧张的;恼火的
He swore in Spanish, an indication that he was rattled. 他用西班牙语宣誓,这表明他很紧张。