The term 'fasten securely' can be accomplished in a variety of ways. Clamping, sealing, riveting, locking, bolting, anchoring, nailing, battening, gluing, lashing, and buttoning down are all methods that can be used to fasten something securely. Clamping involves using a device to hold two or more objects together. Sealing is the process of making something airtight. Riveting is a method of joining two pieces of metal together. Locking involves using a key or combination to secure an object. Bolting is a type of fastener that uses a threaded cylinder to hold two objects together. Anchoring is a way of securing an object to a surface. Nailing is a method of attaching two objects together with a NAIL. Battening is a method of securing two objects together with a strip of wood. GLUE is a substance used to stick two objects together. Lashing is a method of tying two objects together with rope or cord. Buttoning down is a method of securing an object by fastening it with buttons.