jumper

noun
1
a piece of clothing for the upper part of the body, made of wool or cotton, with long sleeves(= arms) and no buttons
پلیور, ژاکت
synonym sweater
2
a loose dress without sleeves(= arms), usually worn over a blouse or sweater
پیراهن بدون آستین
3
a person, an animal or an insect that jumps
جهنده, پرشگر
He's a good jumper.