The definition of forgo is to refrain from doing something or to do without something.(verb)
When you skip dessert after a big meal, this is an example of a situation where you forgo dessert.
See forgo in Webster's New World College Dictionary
See forgo in American Heritage Dictionary 4
also fore·gotransitive verb for·went also fore·went (-wĕntˈ), for·gone also fore·gone (-gônˈ, -gŏnˈ), for·go·ing also fore·go·ing, for·goes also fore·goes
Origin: Middle English forgon
Origin: , from Old English forgān, go away, forgo
Origin: : for-, for-
Origin: + gān, to go; see ghē- in Indo-European roots.
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