immerse
涵 centers on being fully surrounded by a liquid or influence: to immerse something in water, or to be deeply steeped in an idea or quality.
涵 combines 氵 (water) with 函, which likely contributes both sound and the idea of containing or enclosing. The character suggests water enclosing or immersing something.
Water 氵 pours into a container 函, completely immersing whatever is inside. Picture a box filling with water until everything is submerged.
For カン, imagine a can filled with water, immersing a small object: can -> カン, and the water inside the container 函 submerges it completely.