ph.
1. （通常指因紧张而）退缩，躲避
If you hang back, you move or stay slightly behind a person or group, usually because you are nervous about something.
2. 拖延;拖拉
If a person or organization hangs back, they do not do something immediately.
1. to lag or linger behind
e.g. But in so many other areas we still are dragging