someone's heart sinks
US /ˈsʌm.wʌnz hɑːrt sɪŋks/
UK /ˈsʌm.wʌnz hɑːrt sɪŋks/

1.
心沉了下去, 感到失望
if someone's heart sinks, they feel disappointed or sad
:
•
When I saw the long queue, my heart sank.
当我看到长队时,我的心沉了下去。
•
Her heart sank when she realized she had lost her passport.
当她意识到自己丢了护照时,她的心沉了下去。