the world > space > relative position > posture > action or fact of sitting > be sitting or seated [verb (intransitive)] > sit down > heavily or unceremoniously (5)
(to sit) flat down: plump on the ground.
intransitive for reflexive. To deposit oneself, drop down.
intransitive. To drop, sit, or settle down heavily or unceremoniously.
intransitive. To sit down wearily; to flop; to slouch; to loaf. Also with around.