unbend
v
(pt, pp unbent )
1 [I, Tn] (cause sth/sb to) become changed from a bent position; straighten (使某物[某人])由彎變直, 弄直, 挺直.
2 [I] (fig 比喻) become relaxed and informal in behaviour 變得輕松和隨便
Most professors unbend outside the lecture theatre. 教授在課下大都很隨便.