조마조마하다 · 가슴이/마음이 조마조마해요
nervously, anxiously, on edge
Example
합격자 발표를 기다리며 가슴이 조마조마했어요.
My heart was pounding nervously as I waited for the results to be announced.
Word parts
A doubled mimetic word; the repetition mirrors a heart fluttering with worry.