tumbar
/tumˈbaɾ/ · B1 · verb
to knock over, tip
🎳 Sounds like tumble: tumbar = make something tumble, or tumble down yourself
Tumbar and English tumble likely share an old sound-word, tumb, for a thud. Knock a bowling pin over and it tumbles. Tumbarse is the reflexive form: you tumble yourself onto the bed, so it means to lie down.