tough cookie, A person who is strong and resilient, able to handle difficult situations.
tough luck, An expression of sympathy or mock sympathy for someone's misfortune.
Word Origin
Language
Old English
Original word
tōh
Originally meant
strong, durable
Background
The word 'tough' has been used in English since the Old English period, originally meaning strong or durable. It has retained its core meaning over the centuries, expanding to describe both physical and metaphorical strength.