What does sneak up mean?

When you sneak up on someone or something, you approach without being noticed. Sneak up is always followed by the preposition “to” or “on.”

We can use sneak up literally, to describe a person or creature moving stealthily, or we can use it figuratively to describe how events sometimes seem to arrive without our noticing (e.g., “As always,  the examinations  had sneaked up on us”).

You can find synonyms for phrases like “sneak up” using the QuillBot Paraphraser.