ハツ, ホツ, た.つ, あば.く, おこ.る, つか.わす, はな.つ, ば, わ
departure, discharge, publish, emit, start from, disclose, counter for gunshots
JLPT4 G3 S9 F32
The element# combining 癶 (split to right and left) + 殳 action indicator means "split to right and left." 發 adds 弓 bow → arrow splitting from a curved bow in being launched → *release* → *start*; *appear/issue suddenly*; *open/emerge all at once*; *spread/extend outward*; *expose* (by digging up); *send* → *counter for bullets/gunshots*.
[Full Kanji Etymology List]