pit of the stomach

English Thesaurus

1. a slight depression in the midline just below the sternum (where a blow can affect the solar plexus) (noun.body)

hypernym	:	fossa, pit,
definition	:	a concavity in a surface (especially an anatomical depression) (noun.shape)

part meronym	:	breadbasket, stomach, tum, tummy,
definition	:	an enlarged and muscular saclike organ of the alimentary canal; the principal organ of digestion (noun.body)