(one's) heart sinks into (one's) boots negative sentence
Used to express the feeling or emotion of disappointment, sadness, dismay, worry about unfortunate results or unexpected situations.
His heart sinks into his boots when he was announced that he failed the last exam.
Her heart sank into her boots when her husband passed away.
Used to tell someone not to stress about something
Used when you talk about one's feelings of sadness or pain, especially because of lost love or one-sided love
1. A short period of time suffering from depression
2. A hangover
The verb "sink" should be conjugated according to its tense.
Mary will sink into her boots if she knows her boyfriend's betrayal.
This idiom has given rise to the adjective "heartsink" which describes the emotion of a patient who regularly visits to the surgery to complain of persistent but unidentifiable ailments.