n.

1. 退回；逆行
2. 复原；回归

vi.

1. 退回；逆行
2. 复原；回归

v.

1. return to a former state.
   ▸return mentally to a former stage of life or a supposed previous life.
2. Statistics  calculate the regression of.

n.

1. the action of regressing.
2. Philosophy  a series of statements in which a logical procedure is continually reapplied to its own result without approaching a useful conclusion.