fortify

Short definition from Wiktionary

Verb

1. 1
   To give power, strength, or vigour to (oneself or someone, or to something); to strengthen.
2. 2
   To support (one's or someone's opinion, statement, etc.) by producing evidence, etc.; to confirm, to corroborate.
3. 3
   To increase the nutritional value of (food) by adding ingredients, especially minerals or vitamins.
4. 4
   To impart fortitude or moral strength to (someone or their determination, or something); to encourage.
5. 5
   To make (something) defensible against attack by hostile forces.
6. 6
   To make (something) structurally strong; to strengthen.
7. 7
   To increase the defences of (an army, soldiers, etc.), or put (it or them) in a defensive position.
8. 8
   To secure and strengthen (a place, its walls, etc.) by installing fortifications or other military works.
9. 9
   To provide (a city, a fortress, an army, etc.) with equipment or soldiers.
10. 10
    To add spirits to (wine) to increase the alcohol content.
11. 11
    To install fortifications or other military works; also (sometimes figurative), to put up a defensive position.
12. 12
    To become strong; to strengthen.
13. 13
    To undergo, or cause to undergo, fortition.