Merriam-Webster's Collegiate® Dictionary, 11th Edition
SLOUCH
I. noun
Etymology: origin unknown
Date: 1515
1. an awkward fellow ; lout , one that is unimpressive, a gait or posture characterized by an ungainly stooping of the head and shoulders or excessive relaxation of body muscles,
II. verb
Date: 1754
intransitive verb to walk, stand, or sit with a slouch ; assume a slouch, droop , to go or move slowly or reluctantly, transitive verb to cause to droop , sloucher noun