How to Use "toughen" with Example Sentences

1. It might toughen you up a bit .
2. Secondly , obama sought to toughen his line on iran .
3. Let it toughen you up .
4. They jab tree trunks to toughen their hands and practice squatting with other students sitting on their shoulders to build leg strength .
5. Their methods include the use of strips of ion-exchanging plastic , braided with polystyrene to toughen them up ......