5(mining) A tunnel for drawing spent air away from the working face of a mine.
动词verb
1(automotive, intransitive, transitive) To drive dangerously close behind another vehicle.
2To follow another person through access control on their access, rather than on one’s own credentials, especially when entering a door controlled by a card reader.
3(finance, of a broker) To privately purchase or sell a security immediately after trading in the same security for a client.