rearing
Please include a link to the lesson.
Yes, without context, it is impossible to say.
There are too many different uses for the word rearing:
rearing a child; other animals rearing their young; ranchers rearing cattle or other livestock for slaughter; a horse rearing on its hind legs; some ideal “rearing its ugly head,” just to name a few
dictionary entry would be under: rear (verb)
the most general English synonym is: raising
dictionary entry would be under: raise (verb)