Definify.com

Webster 1913 Edition

Toughen

Tough′en

,

Verb.

I.

&

T.

[

imp. & p. p.

Toughened

;

p. pr. & vb. n.

Toughening

.]

To grow or make tough, or tougher.

Webster 1828 Edition

Toughen

TOUGHEN

,

Verb.

I.

tuf'n. To grow tough.

TOUGHEN

,

Verb.

T.

tuf'n. To make tough.