in tow

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective of a vehicle, etc. Pulled by means of an attached line, such as a cable, chain, or rope.
• adjective figuratively Following or accompanying under the direction of another, as if attached by a line and being pulled.
• adverb of a vehicle, etc. In a manner involving being pulled by means of an attached line.
• adverb figuratively In a manner of movement characterized by following another and being under the direction of that other, as if attached by a line and being pulled.