verb (used with object)
Chiefly British Slang. to investigate or figure out (usually followed by out).
Origin of suss
First recorded in 1965–70; earlier, to suspect, a suspect, shortening of suspect
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
verb (tr) slang
(often foll by out) to attempt to work out (a situation, person's character, etc), esp using one's intuition
Also: sus to become aware of; suspect (esp in the phrase suss it)
sharpness of mind; social astuteness
See also sus laws
Word Origin for suss
C20: shortened from suspect
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
"to figure out, investigate and discover," 1966, earlier "to suspect" (1953, police jargon), a slang shortening of suspect (v.).
Online Etymology Dictionary, © 2010 Douglas Harper