Strengthen (verb)

1. To make stronger or more robust; to increase the strength of.
2. To give support or encouragement to; to raise the confidence or resolve of.

Origin:

From middle english strenge(n), from old english strengthian, from strength.

Examples:

1. The government is taking steps to strengthen the economy.
2. The coach's words strengthened the team's resolve.
3. Her faith was strengthened by her experiences.
4. The new laws will strengthen protections for consumers.
5. The treatment strengthened his immune system.