eat up

1. 吃完;吞噬

Eat up the dinner while it is still warm.

趁饭还热,快把它吃完。

2. 消耗;用完

The work ate up all his time.

那工作占用了他所有的时间。

eat out

1. 上馆子吃饭

They usually eat out on Sundays.

星期天他们通常上馆子吃饭。

2. 锈坏;使腐烂

Rust had eaten out the gun barrel.

枪筒已被锈蚀。