verb

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