toughens is a form of:

Toughen



Related forms — noun: toughener — verb: toughen
verb — past tense: toughened ; past participle: toughened ; present participle: toughening ;
1.
(TRANSITIVE) (To make or become tough or tougher) ធ្វើអោយស្វិត
Example: He toughened himself by exercise, The young soldier toughened in service.
2.
(INTRANSITIVE) (To make or become tough) ទៅជាស្វិត
ENGLISH MEANING
verb — past tense: toughened ; past participle: toughened ; present participle: toughening ;
1.
(TRANSITIVE, INTRANSITIVE) To grow or make tough, or tougher.
1.
harden