“简称”这个词用英语怎么说

be short for

一般用be short for或For short,

如 Sb is short for some body.

You can write sb for short.

be short of
abbreviate

in short for
abbreviate

For short,用在句尾。

看你要什么词性的啦。
动词的话一般用be short for.或者abbreviate
名词就是abbreviation。