There are several synonyms for the phrase "not enough to cover," including insufficient, lacking, inadequate, deficient, and meager. Each of these words expresses a similar idea: that there is not enough of something to meet the needs or demands of a situation. For example, a budget that is insufficient may not have enough funds to cover all necessary expenses, while a meal that is meager may not provide enough food to satisfy hunger. The use of synonyms can add variety and nuance to language, allowing for more precise communication and a greater range of expression.