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

1.
とても丈夫な, 非常に頑丈な
very strong and able to deal with difficult situations
:
•
My grandmother is 90 years old and still (as) tough as old boots.
私の祖母は90歳ですが、まだ(古靴のように)とても丈夫です。
•
You need to be (as) tough as old boots to survive in this industry.
この業界で生き残るには、(古靴のように)とても丈夫でなければならない。