The phrase "top something up" is an idiomatic expression often used in everyday language to describe the act of adding more of a substance or filling up something that is partially empty. It is commonly used to refer to refilling or supplementing a container or a resource to ensure that it is at its maximum or desired level.
When used in the context of adding a liquid, such as a drink or fuel, "top something up" signifies the action of filling the container, glass, or tank to its full capacity. For instance, when at a restaurant, a customer may request the waiter to "top up" their glass of water, meaning they would like it to be filled again to the brim.
In a broader sense, the term can also be applied to situations beyond just liquids. It can be used to describe adding more of a particular substance or resource to maintain or replenish its level. For instance, one might say they need to "top up" their phone credit or bank account, meaning they need to add more money to ensure they have sufficient funds.
Overall, "top something up" serves as a versatile expression used to convey the notion of refilling, replenishing, or supplementing a container or resource, be it liquid, financial, or otherwise, to keep it at an optimal or desired level.
