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Beginning
1
English
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1.1
Verb
1.2
Noun
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toughening
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From Wiktionary, the free dictionary
English
[
edit
]
Verb
[
edit
]
toughening
present
participle
and
gerund
of
toughen
Noun
[
edit
]
toughening
(
plural
toughenings
)
The process of making something tougher.
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