caber

To fit — extremely common and highly irregular (quepo, cabes, cabe...; preterite cupe, cupiste...). Central to the fixed expression no cabe duda (there's no doubt) and caber en sí de gozo/orgullo (to be bursting with joy/pride, literally 'not fit in oneself').

• No sé si todo esto cabe en la maleta. — I don't know if all this fits in the suitcase.
• No cabe duda de que trabajó muy duro. — There's no doubt that he worked very hard.
• No cabía en sí de orgullo cuando se graduó su hija. — He was bursting with pride when his daughter graduated.

Learners often confuse caber (to fit) with the unrelated-looking but similarly irregular saber (to know) in the yo form — quepo (from caber) vs. sé (from saber) — since both are irregular first-person forms that don't follow the normal pattern.

• expression "No cabe duda" — One of the most common fixed expressions in Spanish for asserting certainty ('there's no doubt'), used constantly in formal writing, journalism, and everyday speech to affirm a claim without room for question.