I.down1[美 daʊn, 英 daʊn]副down often appears as the second element of certain verb structures in English (back down, clamp down, tone down, etc). For translations, see the relevant verb entry (back, clamp, tone, etc).
The driver tried troubleshooting -- opening the lift, closing the lift, fastening the seatbelt, unfastening the seatbelt, trying to drive the bus with the lift down and the door open...
After the 15-minute journey, many people turn right, off to enjoy the views from the terrace, visit the museum, eat in the restaurant before taking the lift down again.