Definitions from Wiktionary (strengthen)

▸ verb:  (transitive) To make strong or stronger; to add strength to; to increase the strength of; to fortify.
▸ verb:  (transitive) To empower; to give moral strength to; to encourage; to enhearten.
▸ verb:  (transitive) To augment; to improve; to intensify.
▸ verb:  (transitive) To reinforce, to add to, to support (someone or something)
▸ verb:  (transitive) To substantiate; to corroborate (a belief, argument, etc.)
▸ verb:  (intransitive) To grow strong or stronger.
▸ Also see strengthen

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