IPA: /ˈslaʊtʃər/
KK: /ˈslaʊtʃər/
A person who sits or stands with their shoulders and back bent forward, often in a lazy or relaxed manner.
He is a sloucher and often gets told to sit up straight.
Sloucher → The word 'sloucher' is derived from 'slouch' (of uncertain origin, possibly from the dialectal English 'slouch' meaning to droop or sag) and the suffix '-er' (meaning a person who). A sloucher is a person who droops or sags, typically in posture.
Think of someone who 'droops' or 'sags' — that's what a sloucher does, and the '-er' indicates it's a person.