endurecer
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Meanings
Verb
1. to harden, to toughen, make hard (ambitransitive, reflexive)
Examples7
He hardened clay by putting it into a fire.
The families demanded for the law to toughen.
The heat of the sun hardens clay.
France isn't in favor of tightening the positions against Athens either.
Toughen up!
I set my face like a flint because I know I shall not be put to shame.