(as) tough as old boots
US /əz tʌf əz oʊld buːts/
UK /əz tʌf əz oʊld buːts/

1.
아주 강인한, 매우 튼튼한
very strong and able to deal with difficult situations
:
•
My grandmother is 90 years old and still (as) tough as old boots.
우리 할머니는 90세인데도 여전히 (오래된 부츠처럼) 아주 강인하다.
•
You need to be (as) tough as old boots to survive in this industry.
이 업계에서 살아남으려면 (오래된 부츠처럼) 아주 강인해야 한다.