toughen up
US /ˈtʌf.ən ʌp/
UK /ˈtʌf.ən ʌp/

1.
강해지다, 단련하다
to become or make someone stronger, more resilient, or less sensitive to difficulties or criticism
:
•
You need to toughen up if you want to succeed in this competitive industry.
이 경쟁적인 산업에서 성공하려면 강해져야 해.
•
The coach told the team to toughen up and not let the loss affect them.
코치는 팀에게 강해지고 패배에 영향을 받지 말라고 말했다.