Definition from Wiktionary, the free dictionary Audio (US)
(file) - (transitive) To make strong or stronger; to add
strength to; to increase the strength of; to fortify; to
reinforce. - to strengthen a limb, a bridge, an army - to
strengthen an obligation - to strengthen authority. - 1851,
Anonymous, Arthur Hamilton, and His Dog - A little hardship, and
a little struggling with the rougher elements of life, will
perchance but strengthen and increase his courage, and prepare
him for the conflicts and struggles of after years. -
(transitive) To animate; to give moral strength to; to
encourage; to fix in resolution; to hearten. - (transitive) To
augment; to improve; to intensify. - (intransitive) To grow
strong or stronger. to make strong or stronger to grow strong or
stronger