clasp
A fastener that holds two things tightly together.
A clasp is a fastener that holds two things together by hooking, clipping, or snapping shut. The clasp on a necklace connects the two ends of the chain around your neck. A briefcase has a clasp that keeps it closed. Some books have metal clasps that hold the covers shut.
The word also means to grip or hold something tightly. You might clasp your hands together when you're nervous, or clasp a friend's hand when crossing a busy street. A parent might clasp a young child close during a thunderstorm. This kind of clasping suggests both security and care, holding on to something or someone you don't want to let go of.
Notice how both meanings share the idea of bringing things together and keeping them connected. Whether it's the metal clasp on a bracelet or the way you clasp your hands in excitement, the word captures that sense of joining and holding firm.