toughen

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See: inure
References in periodicals archive ?
There's a gorgeous vocal mix featuring St Etienne's Sarah Cracknell and the Micky Slim remix toughens it up quite nicely.
Most often, recurrent blister sites toughen benignly into calluses and that's the end of it.
Earlier this year, Dexco introduced seven grades of styrenic block copolymers that both toughen and compatibilize.