Fortify (verb)

1. Make (a place) stronger and more defensible against attack.
2. Strengthen or invigorate (someone) mentally or physically.
3. Strengthen or enrich (food or drink) with a particular vitamin or mineral.

Origin:

Middle english: from old french fortifier, from latin fortificare, from fortis "strong" + facere "make".

Examples:

1. The castle was fortified to protect it from invaders.
2. The company has been fortifying its financial position.
3. The drink was fortified with vitamin C.
4. He fortified himself with a cup of coffee before the meeting.
5. She fortified herself with a deep breath before starting the presentation.