strengthen.
To make strong or stronger; to add strength to; to increase the strength of; to fortify.
Meaning & usage
To make strong or stronger; to add strength to; to increase the strength of; to fortify.
strengthen a muscle
strengthen a wall
To empower; to give moral strength to; to encourage; to enhearten.
To augment; to improve; to intensify.
To reinforce, to add to, to support (someone or something)
strengthen an army
To substantiate; to corroborate (a belief, argument, etc.)
strengthen the cause
To grow strong or stronger.
Where this word comes from
Etymology tree Proto-Germanic *strangaz Proto-West Germanic *strang Proto-Indo-European *-teh₂der. Proto-Germanic *-iþō Proto-West Germanic *-iþu Proto-West Germanic *strangiþu Old English strengþu Middle English strengthe Proto-Indo-European *-o- Proto-Indo-European *-nom Proto-Indo-European *-onom Proto-Germanic *-aną Proto-Indo-European *-yeti Proto-Indo-European *-éyeti Proto-Germanic *-janą Old English -an Middle English -en Middle English strengthen ▲ Middle English -en Middle English strengthenen English strengthen 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 when the infinitive ending was being apocopated in late Middle English.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.