To tighten or secure with screws.
To twist into a contorted state.
To blunder; to make a mistake.
To raise or summon up.
To make a mess of; to ruin.
To raise (rent, fees, etc.) to extortionate levels.
To release from a fold or pen.
To undo a folding.
To turn out; to happen; to develop.
To open (anything covered or closed); to lay open to view or contemplation; to bring out in all the details, or by successive development.
To reveal.
In functional programming, a kind of higher-order function that is the opposite of a fold.