beware

动词 beware:

1. be on one's guard; be cautious or wary about; be alert to
   同义词：mind

1. Beware your hat, lest it should be blown away.
   当心你的帽子别被吹走。
2. I was told to beware lest I injure him.
   有人关照我，要我小心别伤害他。
3. Beware of what you do with this dangerous substance.
   你处理这些危险品时，可要当心。

be.ware

v.（动词）
be.wared,be.war.ing,be.wares
v.tr.（及物动词）
To be on guard against; be cautious of:
当心；小心：
例句：
.Beware the ides of March.(Shakespeare)
.小心三月十五日.(莎士比亚)

v.intr.（不及物动词）
To be cautious; exert caution:
小心；尽量小心：
例句：
We had to beware of the icy patches on the road. Beware of the dog.
我们要小心路面上的冰；当心狗

来源：
Middle English ben war
中古英语 ben war
ben [to be] * see be
ben [成为] *参见 be
war [on one`s guard] * see ware 2
war [值班] *参见 ware2