heartspoon
/ˈhɑːtspuːn/Now historical and rare
noun
The slight hollow overlying the lower end of the breastbone; also called spoon of the brisket. Also ( English regional ): the navel or midriff.
Origin
Late Middle English; earliest use found in Geoffrey Chaucer (c1340–1400), poet and administrator. In some forms from heart + spoon.