Green’s Dictionary of Slang

1. the left-hand side of one’s body plus the relevant limbs.

1944

in ‘Jiver’s Bible’ in D. Burley Orig. Hbk of Harlem Jive.

2. the left side.

1944

Cab Calloway New Hepsters Dict. in Calloway (1976) 257: left raise (n.): left side. Ex., ‘Dig the chick on your left raise.’.