- to make hard or harder: to harden steel.
- to make pitiless or unfeeling: to harden one's heart.
- to make rigid or unyielding; stiffen: The rigors of poverty hardened his personality.
- to strengthen or confirm, especially with reference to character, intentions, feelings, etc.; reinforce.
- to make hardy, robust, or capable of endurance; toughen.
- to reinforce the structure of (a military or strategic installation) to protect it from nuclear bombardment.
- to become hard or harder.
- to become pitiless or unfeeling.
- to become rigid or unyielding; stiffen: His personality hardened over the years.
- to become confirmed or strengthened: His resistance hardened.
- to become inured or toughened: The troops hardened under constant fire.
- Commerce. (of a market, prices, etc.)
- to cease to fluctuate; firm: When the speculators withdrew from the market, the prices hardened.
- to rise higher.
- English biochemist: Nobel Prize 1929.
- to make or become hard or harder; freeze, stiffen, or set
- to make or become more hardy, tough, or unfeeling
- to make or become stronger or firmer
- to make or become more resolute or set
- (intr) commerce
- (of prices, a market, etc) to cease to fluctuate
- (of price) to rise higher
- a rough fabric made from hards
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