This is the 5886th most frequent Japanese word.
まとう
"まとう" means "to wear" or "to put on" (clothing, accessories, etc.).
Here, "まとう" means to wear or cover oneself with an item, often in a protective or symbolic manner.
勇者は魔法の鎧をまとうことで敵の攻撃を防いだ。
The hero protected against enemy attacks by wearing the magical armor.
In this sentence, "まとう" conveys a sense of enveloping oneself in a garment or in an abstract concept, enhancing the imagery.
その少女は夜の闇をまとうように黒いケープをまとっていた。
The girl wore a black cape, as if enveloped in the darkness of night.
"まとう" is used metaphorically here to describe surrounding or imbuing abstract qualities, like hope in this instance.