What Does "Top Up" Mean?
"Top up" is an English idiom. It means "to refill or replenish something that is running low, especially liquids or supplies."Examples in Sentences
Here are three examples of the idiom "top up" used in a sentence:- She topped up her coffee cup with fresh hot coffee to keep herself awake during the meeting.
- Before the trip, he made sure to top up the car's gas tank to ensure they wouldn't run out of fuel.
- Don't forget to top up the water in the fish tank to keep the fish healthy and happy.

What Is an Idiom?
An idiom is a commonly used expression whose meaning does not relate to the literal meaning of its words. In other words, if you were to translate "Top Up" word for word, there is no guarantee the translation would help you to understand the meaning.An idiom often includes a cultural or historical context that makes it difficult for non-native English speakers to understand. A phrase is classified as an idiom when a direct translation of the words does not reveal the meaning. Most idioms rely on shared knowledge or experiences known only to a specific community.
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