Fish. Know that you have the love of the people, my heart suddenly sank.

鱼。知道你有喜欢的人了，我的心一下子沉下去了。

youdao

When this realization hit, it was as if a huge iceberg in my heart suddenly melted.

意识到这点时，仿佛我心里的一块巨大的冰山突然融化了。

youdao

He felt suddenly faint, and his heart began to palpitate.

他突然感到晕厥，心脏也开始悸动。

《柯林斯英汉双解大词典》

"He was taken to the emergency room, and at 3 a.m. today, his heart just suddenly stopped, " his mother said.

CNN: SHARE THIS

It suggested that Falwell's heart had stopped suddenly, causing him to fall forward, striking his nose on the desk before sliding to the floor.

FORBES: Magazine Article

Their coach, Randy Walker, 52 years old, died very suddenly of a heart attack.

NPR: College Football Kicks Off with Big Games