If guilty is to innocent, then lose is to what?

The relationship between "guilty" and "innocent" is one of opposites; they represent contrasting states in the context of morality or legality. Similarly, "lose" is an action that represents the opposite of "gain," which refers to acquiring something or having a positive increase. Just as being guilty means not being innocent, losing means not gaining. Therefore, "gain" is the word that correctly completes the analogy by maintaining the same oppositional relationship found in the first pair.