tag along
To accompany or closely follow someone or a group, perhaps when one is not part of the group or when one's presence is not wanted. I decided to tag along and see if they found anything interesting. Do you mind if my little brother tags along? My parents want him to get out of the house for a while.
tag along (after someone)
and tag along (behind someone)to follow along after someone; to go along with someone. The family dog tagged along after the children wherever they went. Can I tag along? Do you mind if I tag along behind you?
tag along
v. To follow after; accompany: If you're going to the mall, do you mind if I tag along? My sister tagged along with me to the beach.