Real Dictionary

hunch
countable noun: If you have a hunch about something, you are sure that it is correct or true, even though you do not have any proof.
verb: If you hunch forward, you raise your shoulders, put your head down, and lean forwards, often because you are cold, ill, or unhappy.
verb: If you hunch your shoulders, you raise them and lean forwards slightly.

hunch in American English
a hump
to draw (one's body, etc.) up so as to form a hump; arch into a hump
to move forward jerkily; push; shove
intransitive verb: to thrust oneself forward jerkily; lunge forward
noun: a premonition or suspicion; guess
transitive verb: to thrust out or up in a hump; arch

hunch in British English
noun: an intuitive guess or feeling
verb: to bend or draw (oneself or a part of the body) up or together