unbend
verb- [intransitive]
to relax and become less strict or formal in your behaviour or attitude （在行为或态度上）放松；变得无拘束；随和 He could be fun if he’d unbend a little. 如果他放松一点，他会很有趣的。
- [transitive, intransitive] unbend (something)
to make something that was bent become straight; to become straight 拉直；抻直；变直