shrug (n.) Look up shrug at Dictionary.com
a shoulder motion meant to express indifference, want of an answer, etc., 1590s, from shrug (v.).
shrug (v.) Look up shrug at Dictionary.com
c.1400, schurgyng, of uncertain origin. Perhaps connected to Danish skrugge "to stoop, crouch." Related: Shrugged; shrugging. To shrug (something) off "dismiss" is recorded from 1909.