To wit is an expression used to introduce a statement that clarifies or explains something previously said. It is derived from the Latin phrase 'VIDELICET, ' which translates to 'NAMELY' or 'that is to say.' It is often used in legal documents and other formal writing to indicate that the following statement is an explanation of what was previously stated. In crosswords, it is typically abbreviated as 'TW, ' 'NAMELY, ' 'VIDELICET, ' or 'IDEST.'