He decided to toughen up and face his fears.

The tougheners are added to the paint to increase its durability.

The toughener is added to the paint to make it more durable.

Regular exercise toughens the body and strengthens the mind.

He toughened up after facing many challenges.

He is toughening up his body by lifting weights.

The toughening of the steel increases its durability.

The glass is toughenable through a special heating process.

The toughenings on the surface of the metal provide extra strength.

You need to toughen up if you want to succeed in this competitive industry.