verb
to make or become tougher or stronger
adjective
having strength or resilience
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The new training program is designed to toughen up our employees for the challenges ahead.
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If you want to get stronger, you'll have to toughen up and push yourself harder at the gym.
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You need to toughen up and stop letting things get to you so easily.
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Going through difficult times can toughen you up and make you more resilient in the long run.