Meaning of “boarder” - Learner’s Dictionary

boarder

noun [ C ] us uk /ˈbɔːdər/
STUDENT mainly UK

a student who lives at school

PERSON US UK lodger

someone who pays for a place to sleep and meals in someone else's house

SPORT

someone who goes snowboarding (= sport where you stand on a board to move over snow)

(Definition of “boarder” from the Cambridge Learner’s Dictionary © Cambridge University Press)