燃放
rán fàng · HSK 7
to set off
🎆🧨 燃 = ignite + 放 = release; together: set off fireworks/firecrackers
燃 means to ignite or burn (it shares the fire radical 火). 放 means to release or let go. Combine ignite plus release and you get the act of lighting and setting off firecrackers.
放 — 方 (square/phonetic) + 攵 (rap/strike radical)
放 is a semantic-phonetic compound: 方 supplies the sound and 攵 (a hand holding a stick) supplies the meaning of striking or driving away. The original sense was to banish or drive out, which broadened over time to 'release', 'let go', and 'put down'.