English » German

I . tough·en [ˈtʌfən] VB trans

1. toughen (strengthen):

toughened glass

2. toughen (make difficult to cut):

II . tough·en [ˈtʌfən] VB intr

toughen up VB trans

1. toughen up (strengthen):

2. toughen up (make more stringent):

Examples from the PONS Dictionary (editorially verified)

toughened glass

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