胸(むね)が高鳴(たかな)る

むねがたかなる
expression
one's heart pounds; to be thrilled; to feel excited anticipation
emotionbody-part
1. one's heart pounds; to be thrilled; to feel excited anticipation
describes the physical and emotional sensation of one's heart beating with excitement, anticipation, or strong emotion
旅行(りょこう)の前日(ぜんじつ)は胸(むね)が高鳴(たかな)る。
The day before a trip, my heart pounds with excitement.
My heart pounded at the moment I saw the exam results.
After making plans for a first date, I felt my heart pounding.

An expressive idiom for positive excitement and anticipation. The image is of one's heart/chest beating loudly due to excitement. Almost always describes positive or thrilling emotions rather than fear or anxiety.

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Common patterns

高鳴(たかな)る (to ring loudly) is a compound verb from 高(たか)い + 鳴(な)る. The expression paints the image of one's heartbeat sounding loud.