arrellanarse

A literary-leaning verb meaning to settle in comfortably, sprawling or sinking into a seat — think of someone sinking deep into an armchair with no intention of moving. It carries a slight connotation of self-satisfied ease, sometimes bordering on laziness.

• Se arrellanó en el sofá con el mando a distancia. — He sank comfortably into the sofa with the remote control.
• Nos arrellanamos junto al fuego toda la tarde. — We settled in comfortably by the fire all afternoon.
• Se arrellanaba en su sillón favorito cada noche. — He would settle into his favorite armchair every night.

Reaching for arrellanarse in everyday speech where sentarse or acomodarse would sound more natural — it's a somewhat literary word, used for a vivid, self-indulgent kind of settling in rather than plain "sitting down."

Often confused with acomodarse.