verb

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