推進
すいしん · suishin · JLPT N1 · noun
propulsion; driving force
🚀 推 = push + 進 = advance: pushing something forward is propulsion
Rocket engines provide 推進力 (suishinryoku), the thrust that drives a craft forward. The same 推進 root also means driving force in a broader sense, such as a company's growth engine.
推 — hand radical 扌 + 隹 (short-tailed bird)
A semantic-phonetic compound: the hand radical 扌 gives the meaning 'to push' or act with the hand, while 隹 supplies the sound (originally close to 'tui'). The core sense has stayed remarkably stable, expanding from physical pushing to figurative uses like 'recommend' or 'infer'.