The term 'closed securely' can be described by two crossword solutions: 'sealed' and 'LATCHED'. Sealed is a 6-letter word meaning to close or fasten something tightly so that no air, liquid, or other substance can enter or escape. LATCHED is a 7-letter word meaning to fasten or secure something with a latch, which is a device used to hold a door, gate, or window shut. Both words describe the action of closing something securely, ensuring that nothing can enter or escape.