to give a baby a name at a Christian ceremony and make him or her a member of the Christian Church

She's being christened in June. 她将在6月受洗礼。

[ + noun ] She was christened Maria. 她受洗时取名为玛丽亚。

to give a person a name based on a characteristic that they have

We christened him "Slowcoach" because he took so long to do anything. 我们给他起了个绰号叫“慢车”，因为他干什么都要花很长时间。

to use something for the first time

I'm going to christen my new walking boots on Saturday. 我打算星期六开始穿我那双新的步行靴。