溶かす
とかす · tokasu · JLPT N2 · verb-godan
to dissolve
🧊 溶 = water radical 氵 + 容 (contain): a solid is held by water until it melts away
The kanji 溶 combines the water radical 氵 with 容 (contain), so it means a solid dissolving into liquid. The ending かす is the causative, meaning to make something melt or dissolve.