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APA
heartsink. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/heartsink
MLA
“heartsink.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/heartsink. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “heartsink,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/heartsink.
Source: heartsink on Wiktionary, CC BY-SA 4.0.