TIGHTENED (UP)' The term 'TIGHTENED (UP)' is a 6-letter crossword solution that can be used to describe the act of making something more secure or compact. It is often used in reference to physical objects, such as tightening a screw or a belt, but it can also be used figuratively to describe a situation that has become more strict or controlled. For example, a government might tighten its regulations or a company might tighten its budget. In any case, the term 'tightened (up)' implies a sense of increased security or control.