What is fly and watch?

Fly and watch are two completely different things with no direct connection between them.

Fly refers to the act of personnel air travel using an aircraft. It can also refer to insects that have wings and are capable of flight.

Watch, on the other hand, is a device used to measure time and has evolved over time from sundials to mechanical watches to digital watches. A watch can also refer to the act of being on the lookout for something or to observe attentively.

Both are common words, but they do not necessarily have anything to do with each other.