This is the 2881st most frequent Russian word.
бою
The Russian word "бою" is a dative singular form of "бой," meaning "battle" or "fight," translated as "to the battle/fight" or "for the battle/fight."
The word 'бою' is in the dative case of 'бой' (battle), showing readiness towards it.
Я готовлюсь к бою.
I am preparing for the battle.
The word 'боя' is in the genitive case to indicate motion away from the fight.
Я убежал от страшного боя.
I ran away from the terrible fight.
The word 'бою' is in the prepositional case because it follows the preposition 'о' to reflect the subject of thought.