toughen
Concise Oxford English Dictionary © 2008 Oxford University Press:
toughen/ˈtʌfn/
▶verb make or become tough.
– derivatives
toughener noun.
toughener noun.
'toughen' also found in these Oxford entries:
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toughenConcise Oxford English Dictionary © 2008 Oxford University Press: toughen/ˈtʌfn/ ▶verb make or become tough. – derivatives toughener noun. 'toughen' also found in these Oxford entries:
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