verb
definition
To make tough.
definition
To become tough.
noun
definition
The process of making something tougher.
Examples of toughening in a Sentence
Our roads will be made safer with a Road Safety Bill, toughening up the penalties for drunk and uninsured drivers.
Over the recent 25 year properties of thermoplastic adhesives have been enhanced by toughening such that that variants are available suitable for structural duties.
Despite the recent toughening of the inspection rules, there were 46 percent fewer failing schools in 2003 than in 1997.
The main subjects of the Seville summit were the strengthening of " fortress Europe " and the toughening of immigration laws.
The U.S. and British proposal boils down to a further toughening of sanctions against Baghdad.