The antonyms for the word "over-flow" can vary depending on the context in which it is used. However, some of the most common antonyms include "underflow," "deficiency," "shortage," "lack," "depletion," "insufficiency," and "deficit." These words all refer to the opposite of an overflow, indicating that there is not enough of something. For example, an underflow would refer to a situation where there is too little water in a reservoir, while a shortage would refer to a lack of resources or supplies. In general, these antonyms describe situations that are characterized by a lack or deficiency rather than an excess or overflow.