an assistant or helper. a follower or supporter of a person or cause.

What does the term Offsider mean?

Australia. : helper, assistant, associate, follower wanted him as offsider on the boat— Vance Palmer an offsider of the governor, too— Thomas Wood †1950.

What is an Offsider in Australia?

Most overseas dictionaries describe an offsider as a player in the wrong place on a football field. The Australian meaning arose from a bullock-driver's assistant being called an offsider. ... The earliest citation for this distinctively Australian use of offsider is from 1879.