sneak up
phrasal verbPart ofsneak
sneak up — phrasal verb
1. To move quietly and secretly toward someone or something so that they do not not
1.phrasal verb
Definition
To move quietly and secretly toward someone or something so that they do not notice you until you are close.
Example
Maya tried to sneak up on her brother, but he heard her footsteps.
Did you see the cat sneak up on that bird in the garden?