1. a person who follows or accompanies others without being invited
Usage: informal

1. designed to follow or accompany something else

Examples

• My little brother is always such a tagalong when I go out with friends.
• She felt like a tagalong at the business meeting.
• The tagalong trailer made the camping trip much easier.
• He brought his tagalong bike attachment for his toddler.
• Nobody wants to be the tagalong in the group.
• The tagalong cart held all our extra supplies.