すぐに
すぐに · suguni · JLPT N5 · adverb
immediately
⚡ sugu (right away) + ni (adverb particle) = right-away-ly
Sugu originally meant straight or direct (直ぐ), so the sense is going straight to it with no detour in time. The particle ni turns it into an adverb. Sound hook: Sue, go! Now! — Sue-goo-nee.