to breathe upon
喣 centers on the act of breathing upon something, typically with a gentle or warming exhalation.
喣 combines 呴 (which itself contains 口 'mouth' and 勹 'wrap') with 灬 (fire). The structure suggests breathing out warmth, but the exact historical development is uncertain.
The top part 呴 looks like a mouth (口) wrapped around something, and the bottom 灬 is fire. Imagine breathing warm air from your mouth onto a small fire to keep it alive.
For ク, picture breathing cool air onto a hot surface: cool -> ク, and your breath gently cools the fire below.