entire, whole
囫 centers on the idea of something being complete and undivided: entire or whole. It describes a state where nothing is missing or broken apart.
囫 combines the enclosure 囗 with 勿. The exact historical development is uncertain, but the structure likely suggests something contained and complete.
The enclosure 囗 wraps around 勿, like a container holding everything together. Picture a sealed box that keeps its contents whole and entire.
For コツ, imagine a whole box of cots (small beds) packed tightly inside the enclosure: cots -> コツ, and the box keeps them all together.