To impart strength or vigor to.
To increase the nutritional value of food by adding ingredients.
To increase the defenses of; to strengthen and secure by military works; to render defensible against an attack by hostile forces.
To add spirits to wine to increase the alcohol content.
To cause to give a higher tone or sound; to give a higher tone to; to make more intense; to heighten; to strengthen.
To firm and strengthen the muscles of the body by regular exercise.