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Meaning of harden up | Babel Free

Verb CEFR B2

Definitions

To tighten up a sailboat's sheets in order to prevent luffing.
UK
To become or make (something, someone) hard, either literally or figuratively.
informal, transitive

CEFR level

B2

Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.

See also

hardened hardened one's neck hardened someone's heart hardened up hardenest hardeneth