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touchwood
touchy
touchy-feely
tough
tough love
tough-minded
toughen
toughie
toughness
Toulon
Toulouse
toun
toupee
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tour of duty
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toughness

tough·ness [ túfnəss ]


noun 
Definition:
 
1. state of being tough: the fact or quality of being tough

2. resistance of metal to stress: the resistance of a metal to breaking under repeated twisting and bending forces, measured in kilojoules

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