intervenir
/inteɾbeˈniɾ/ · B2 · verb
to intervene
✋ inter + venir = to come between, so you step into a matter
From Latin intervenire: inter (between) + venire (to come). Spanish venir still means to come, so intervenir is literally to come in between. It is a cousin of English intervene, and it also covers taking part, as in intervenir en un debate.