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Toughen Definition & Meaning - Merriam-Webster
TOUGHEN | English meaning - Cambridge Dictionary
TOUGHEN | definition in the Cambridge English Dictionary
TOUGHEN Synonyms: 66 Similar and Opposite Words - Merriam-Webster
TOUGHEN Definition & Meaning | Dictionary.com
toughen verb - Definition, pictures, pronunciation and usage …
Toughen - Definition, Meaning & Synonyms | Vocabulary.com
TOUGHEN definition in American English | Collins English Dictionary
TOUGHEN Definition & Usage Examples | Dictionary.com
toughen | definition in the Cambridge Learner’s Dictionary