slouch|slouched|slouches

别在沙发上懒散地坐着，坐直一点！

Don't ___slouch on the couch – sit up properly!

他懒洋洋地瘫在沙发上，什么也不想做。

He ___slouched on the sofa, not wanting to do anything.

他整个下午都懒洋洋地躺在沙发上。

He ___slouches on the couch all afternoon.