American Dictionary

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Definition toughen in American English

toughen verb

verb
/ˈtʌf(ə)n/
1

to become more strict, or to make something more strict

Synonyms and related words
2

to become mentally or physically stronger, or to make someone mentally or physically stronger

Example

Prison life has toughened him up.

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3

to become more difficult to cut or eat

Synonyms and related words
Definition toughen in American English