toughen

Verb

 * 1)  To make tough.
 * 2)  To become tough.
 * 1)  To become tough.

Translations

 * Bulgarian:
 * Finnish:, ,
 * Irish: cruaigh
 * Maori: whakapūioio, whakamarohi, whakapakeke
 * Russian: ,


 * Bulgarian: втвърдявам се
 * Czech:, ztvrdnout
 * Finnish:, , karkaistua
 * German:
 * Irish: cruaigh
 * Slovak: stvrdnúť, stuhnúť