Meaning of JUMPER in English
/ ˈdʒʌmpə(r); NAmE / noun
( BrE ) a knitted piece of clothing made of wool or cotton for the upper part of the body, with long sleeves and no buttons :
a woolly jumper
( NAmE ) = pinafore
a person, an animal or an insect that jumps :
He's a good jumper.
senses 1 to 2 mid 19th cent. (originally meaning a loose jacket worn by sailors): probably from dialect jump short coat , perhaps from Scots jupe a man's (later also a woman's) loose jacket or tunic , via Old French from Arabic jubba . Compare with jibba .
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005