II.in [美 ɪn, 英 ɪn]副in often appears as the second element of certain verb structures in English (close in, hand in, stand in, etc). For translations, see the relevant verb entry (close, hand, stand, etc).
It was a three-wheeler with a single wheel in the front to steer, and to provide propulsion from a 450 cc one-cylinder engine mounted directly above it.
During the race, the steering wheel broke, but he continued, informing his mechanic by frantically waving the steering wheel in the air on the home straight.