RhymeZone: underdose definitions

Definitions of underdose:

noun: An inadequate dose (of a medication).
noun: (figuratively) An inadequate amount of something.
verb: (transitive, intransitive) To administer an inadequate dose (to someone or to oneself).
verb: (transitive) To administer an inadequate dose of (a medication).
verb: (figuratively, intransitive) To use a scant or inadequate amount of an ingredient or product.

(Definitions from Wiktionary)