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Wiktionary
tag along

vb. (context idiomatic English) To accompany, join, or follow; to go with.

WordNet
tag along

v. go along with, often uninvited; "my younger brother often tagged along when I went out with my friends"

Usage examples of "tag along".

If things really got bad, folks could probably tag along with the group and fly by the seat of their pants.

Then suppose you come to my suiteif you still consider it my suiteand we'll decide where your ship is headed, and whether I want to tag along.

The Coast Guard already had a bird up, so Moffitt made another call and got cleared to tag along.

Like a shark sensing blood, a Soviet guided-missile destroyer did tag along with the Liberty for a while, but the two American destroyers and a fleet ocean tug trailed Liberty to recover any papers before the Russians had a chance to grab them.