verb
Fastened is the past tense and past participle form of the verb 'fasten', which means to close or attach securely.
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The safety harness must be securely fastened before starting the experiment.
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Make sure your seatbelt is fastened before we hit the road.
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I quickly fastened my shoelaces before running to catch the bus.
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Her attention was fastened on the speaker, captivated by every word.