The crossword solution for the term 'secured tightly' is 'trussed, ' which is a seven-letter word. Trussed is a verb that means to tie or bind something securely, usually with rope or string. It is often used in reference to tying up animals or securing cargo on a ship. In architecture, trussing is the process of connecting structural elements together to form a rigid frame. This process is used to support roofs and bridges. In cooking, trussing is the process of tying poultry or other meats with string before roasting them.