(military) To increase the defenses of; to strengthen and secure by military works; to render defensible against an attack by hostile forces. / (figuratively) To impart strength or vigor to.

From one place to another and back again.

Going from one place or position to another and back again.

The movement (of someone or something) forward followed by a return to the same position. May refer to a concept such as an emotional state or a relationship as well as a physical thing.

simple past tense and past participle of fortify

A fortified wine.

Having strong defenses.

Straightforward; not evasive; candid and direct. / Frank, outspoken. / Markedly simple. / Fixed; settled; decided. / (archaic) Proceeding straight forth.

(archaic) A straight path.

Expressly, frankly, unhesitatingly. / At once, forthwith. / Swiftly. / (archaic) Straight forward, in a straight direction.