creep up on
Intermediate (B1) neutral
To quietly move close to someone before they notice you, or for something to happen slowly and surprise you.
"He crept up on his sister and shouted 'boo' to make her jump."
To quietly move close to someone before they notice you, or for something to happen slowly and surprise you.
"He crept up on his sister and shouted 'boo' to make her jump."