KanjiJLPT N5
Departure

departure, discharge, publish, emit, start from, disclose, counter for gunshots

Mnemonic

Under the tipi, two pairs of legs kick frantically — the nomads are late for departure! The caravan won't wait, so the two scramble out, tripping over each other as the shelter collapses behind them. Those legs have never moved so fast.
Additional thoughts
Picture looking at the tipi from outside: two sets of legs poking out the bottom, flailing as their owners rush to pack up and leave. The collapsing tipi adds urgency — departure is NOW.
Quick recall
Two pairs of legs bolt from a collapsing tipi in a frantic departure.

Details

The keyword for 発 is departure. This kanji conveys the fundamental idea of something being sent out, launched, or set into motion from a starting point. It encompasses meanings related to leaving, emission, and the beginning of action or movement. By extension, it also carries the sense of revealing, expressing, or triggering something, as in the release of energy or the outbreak of an event.
On'yomi
はつ、ほつ
Kun'yomi
た.つ、あば.く、おこ.る、つか.わす、はな.つ

Used in kanji