Also means
pigeonhole
Usage Note
Casilla is a small square or compartment — the box in a form, a square on a chessboard, a post-office box, or a goalkeeper's goal. The idiom sacar a alguien de sus casillas ('to drive someone out of their boxes') means 'to drive someone mad'. Do not confuse with caja ('box' as a container).
Examples
"Rellena todas las casillas del formulario."
Natural Translation
Fill in all the boxes on the form.

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