Definition of "tagalong"

Not much of a fighter, he is a quiet, tag-along mascot.

1979 April 14, Pat M. Kuras, “Street Fantasy”, in Gay Community News, page 12

We started about 6 o'clock with a few tagalongs and our little group got smaller and smaller with each bar until it was just the three of us.

2003, John Hoover, How to work for an idiot

Being in love is one of the greatest experiences you can have, but it also opens the door for all kinds of tagalongs, such as attachment […]

2008, Sharon Janis, Spirituality For Dummies