acovachar

A regional word (from covacha, a shabby dwelling or den) meaning to hide or conceal something, or — more often used reflexively, acovacharse — to shelter oneself away, huddle for protection, or become reclusive. In the Dominican Republic it specifically describes someone who shuts themselves indoors and won't go out.

• Acovachó el dinero debajo del colchón. — He hid the money under the mattress.
• Desde el divorcio, se acovacha en su casa y no sale. — Since the divorce, he's shut himself in at home and won't go out.
• Los niños se acovacharon bajo la mesa durante la tormenta. — The children huddled under the table during the storm.

This is a strong regionalism (mainly Caribbean Spanish) — using it with speakers from Spain or most of South America risks not being understood at all; esconder(se) is the safe, universally understood choice.