fortify
for-ti-fy
verb
To strengthen someone physically or mentally, or to enrich a substance.
"A good breakfast will fortify you for the day."
verb
To strengthen a place or position, often with defensive structures, against attack.
"They decided to fortify the castle walls."
Thesaurus
Synonyms: fort, arm, gird, build up, beef up, strengthen, lace, spike
Antonyms: demilitarise, demilitarize, disarm, weaken