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Definition of toughen : To grow or make tough, or tougher.

Synonyms:

indurate, caseharden, resist, season, acclimatize, continue, acclimate, strong

empower, brace, harden, enliven, prop, invigorate, temper, reinforce, buttress, energize, strengthen, vivify, beef up, fortify, support

Usage examples:

• Never frighten a child by throwing cold water on it or by giving it a too sudden cold plunge; great harm may be permanently done by these efforts to " toughen the baby." - "The Mother and Her Child", William S. Sadler Lena K. Sadler.
• It seems a very comfortable and sensible way to ride, but I shall have to toughen up a bit before I hit the trail for any length of time. - "The Prairie Wife", Arthur Stringer.
• I'll toughen up out here and have better wind for the big finish when I sit in on the old man's money. - "The Flockmaster of Poison Creek", George W. Ogden.