ride-along

Short definition from Wiktionary

Noun

1. 1
   Alternative form of ridealong.
2. 2
   A person who goes on a ridealong.
3. 3
   A member of an organization who is more of a follower than a leader.
4. 4
   A piece of marketing material that is included in a mailing about a different product.
5. 5
   Misspelling of ridealong.

Verb

1. 1
   To go for a ride with another or others; especially, to join police officers on their patrol in a patrol car.