slouch

slouch verb [ I ] uk/slaʊtʃ/ us
to stand, sit, or walk with your shoulders forward so that your body is not straight

сутулиться
Stop slouch ing and stand up straight.

SLOUCH noun

uk/slaʊtʃ/ us
[ no plural ] the position your body is in when you slouch

сутулость
 be no slouch informal
to work very hard and be good at something

неплохо справляться с чем-либо
He's no slouch when it comes to cooking.