びっくりする
びっくりする · bikkurisuru · JLPT N4 · noun
to be surprised
🎁 bikkuri = a jolt word (the kk is the gasp) + suru = to do
びっくり is a mimetic word: the doubled kk makes a tiny stop, like a caught breath. する turns it into a verb, so it is literally to do a startle. Sound hook: a BIG CURIe-ous shock = bikkuri.