toughen
verb- [transitive, intransitive] toughen (something) (up)
to become or make something stronger, so that it is not easily cut, broken, etc. （使）坚硬，坚固 toughened glass 钢化玻璃
- [transitive] toughen something (up)
to make something such as laws or rules stricter 加强，强化（法律、规定等） - [transitive] toughen somebody (up)
to make somebody stronger and more able to deal with difficult situations 使更坚强；使坚韧 His parents sent him away to school to toughen him up. 他的父母送他去学校让他坚强起来。