stomach

an army marches on its stomach soldiers or workers can only fight or function effectively if they have been well fed.

☞ The saying has been attributed to both Frederick the Great and Napoleon I. It is a version of the French phrase c'est la soupe qui fait le soldat.

have butterflies in your stomach: seebutterfly.

have eyes bigger than your stomach: seeeye.

on a full (or an empty) stomach having (or without having) eaten beforehand.

the pit of your stomach: seepit.

sick to your stomach: seesick.

a strong stomach an ability to see or do unpleasant things without feeling sick or squeamish.

turn someone's stomach nauseate someone.