Real Dictionary

groom
If you are groomed for a special job, someone prepares you for it by teaching you the skills you will need.
countable noun: A groom is someone whose job is to look after the horses in a stable and to keep them clean.
countable noun: A groom is the same as a bridegroom.
verb: If you groom an animal, you clean its fur, usually by brushing it.

groom in American English
a person whose work is tending, feeding, and currying horses
to clean and curry (a horse, dog, etc.)
noun: a bridegroom
transitive verb: to tend carefully as to person and dress; make neat or tidy

groom in British English
to make or keep (clothes, appearance, etc) clean and tidy
noun: a person employed to clean and look after horses