1. I brought an umbrella just to be on the safe side.
我带了伞，以防万一。

2. We left early to be on the safe side.
为了保险起见，我们提前离开了。

3. You should save your work on the safe side.
你应该保存文件以防万一。

4. She checked the address again on the safe side.
她为了稳妥起见又核对了一遍地址。

A: Should we bring extra water for the trip?
A：我们旅行要多带点水吗？

B: Yes, just to be on the safe side.
B：是的，以防万一。

1) 为保险起见采取更谨慎的做法

2) 在不确定情况下选择更安全的方案

3) 避免风险或潜在问题的预防性行为

4) 提前做好准备以防意外情况发生

1. 为保险起见；谨慎起见

e.g. I locked the door again on the safe side.
为了保险起见我又锁了一次门。

2. 更稳妥的做法

e.g. She called him on the safe side.
她为了稳妥起见给他打了电话。

phrase

1. used to say that someone does something in order to avoid risk or ensure safety.

Synonym: just in case, to be cautious