The term 'TIED FAST' can be described by two crossword solutions: MOORED (6 letters) and LASHED (6 letters). MOORED is a term used to describe the process of anchoring a boat or ship in a particular place, usually by tying it to a dock or other structure. LASHED is a term used to describe the process of binding something together with rope or cord. Both terms are commonly used to describe the act of securely fastening something in place.