I.toughen up VB [Am ˈtəfən -, Brit ˈtʌfn -] (v + adv + o, v + o + adv)
1. toughen up (strengthen):
2. toughen up person:
- toughen up (make physically resilient)
- toughen up (make emotionally resilient)
- toughen up (make emotionally resilient)
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