HARDEN
- to make hard [v HARDENED, HARDENING, HARDENS]
- become gradually acclimatized to unfavorable conditions often used with off plants hardened off before the first frost
- to make hard or harder; to strengthen, reinforce, toughen, or stiffen
- to make unfeeling
- to reinforce the structure of something to protect it from nuclear attack
- to become harder, tougher, stiffer, etc.
- (of a market, prices, etc.) to firm up or rise
- to make hard or harder
- confirm in disposition, feelings, or action
- make callous hardened his heart
- ure toughen harden troops
- inure to unfavorable environmental conditions (as cold) often used with off harden off seedlings before transplanting
- become firm, stable, or settled
- protect from blast, heat, or radiation (as by a thick barrier or placement underground)
- become hard or harder
- assume an appearance of harshness or severity her face hardened at the thought
- to make hard (firm and unyielding) [v -ED, -ING, -S]
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