発条

noun

spring (device made of flexible material) / (by extension) springiness, bounce, resilience (such as physical or emotional)

彼は時計の発条を巻きました。

He wound the spring of the clock.

意味（1）

spring (device made of flexible material)

意味（2）

(by extension) springiness, bounce, resilience (such as physical or emotional)

bane tsuyoki kokoro no Jirō haJirō of the heart of strong resilience → Jirō of the resilient heart...

意味（3）

(uncommon, possibly dated, figuratively) a springboard, spark, or catalyst leading to some other change

jūmin undō ga bane to natte kichi ga tekkyo saretaWith the protests by residents as the catalyst, the base was shut down