(as) tough as old boots
US /əz tʌf əz oʊld buːts/
UK /əz tʌf əz oʊld buːts/
1.
very strong and able to deal with difficult situations
:
•
My grandmother is 90 years old and still (as) tough as old boots.
•
You need to be (as) tough as old boots to survive in this industry.