Slouch/slaʊtʃ/ Definition 1 of 3Pro Tip 1/3Posture Indicator Use 'slouch' to describe someone's poor posture, indicating laziness or tiredness. After hours of work, he began to slouch over his desk. Pro Tip 2/3Informal Usage 'Slouch' is casual language, fitting for everyday conversation or informal writing. Stop slouching; you look so unprofessional right now. Pro Tip 3/3Physical Activity 'Slouch' can imply a lack of energy or care even in physical actions. He slouched through the party, barely talking to anyone.