oponer
/opoˈneɾ/ · B1 · verb
to pit
🥊 o + poner (to put) = to put against; a cousin of English oppose
From Latin opponere: ob (against) + ponere (to put). If you know poner (to put), oponer is putting something against something else. It conjugates like poner: me opongo, opuse, opuesto.