1. eat in a restaurant instead of at home在餐館吃飯Once in a while we eat out. 我們時而在外面飯店用餐。 We need a babysitter tonight,because we are eating out. 今晚我們需要一個看孩子的,因為我們要在外面吃飯。2. rust;rot or be destroyed使生鏽;使腐爛 Rust has eaten out the sword. 劍已經生鏽了。