To make strong or stronger; to add strength to; to increase the strength of; to fortify.
strengthen a muscle
To empower; to give moral strength to; to encourage; to enhearten.
Charge Joshua, and encourage him, and strengthen him.
To augment; to improve; to intensify.
From rare Middle English strengthenen (14th c.), from earlier strengthen (12th c.), where -en is the infinitive ending. Probably the original form was reinterpreted as strength + -en around the time w...
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