/ ˈdʒʌmpə(r); NAmE / noun
1.
( 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
2.
( NAmE ) = pinafore
3.
a person, an animal or an insect that jumps :
He's a good jumper.
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WORD ORIGIN
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 .