Meanwhile for most idioms meanings can be seen as motivated, but not arbitrary.

习语的语义也不是任意性的，而是有理据和动因的。

youdao

This intuition is not arbitrary or irrational, but is based on years of painstaking practice and hands-on experience that build skills.

这种直觉不是武断的或非理性的，而是建立在多年艰苦的实践和建立技能的实际经验的基础上的。

youdao

People don't sustain practices for silly or arbitrary reasons, but because they resolve some tension that may not be evident from outside the group.

人们不会因为愚蠢的或者武断的原因而支持实践，但是会因为他们要缓解在外行看来不明显的压力而那么做。

youdao

What does count as a violation is an arbitrary taking because that would essentially say, not only to Bill Gates, but to everyone, there is no rule of law.

只有肆意掠夺才算侵犯自然权利,因为从本质上说，那不仅侵犯了比尔·盖茨，还侵犯了其他人，那样就毫无法治可言。

耶鲁公开课 - 公正课程节选

Exacting a threshold by which utility companies must supply green energy is not just arbitrary but also expensive, forcing consumers to buy products that they may not typically select, the groups say.

FORBES: Lobbyists Try to Halt State Green Energy Standards

She said unions were willing to work with departments to make efficiencies, but did not want an "arbitrary cut".

BBC: NEWS | UK | Scotland | Civil servants take strike action

But there need not always be arbitrary, inefficient, and wasteful government regulation.

FORBES: The Economy Needs A 'Deregulatory Stimulus'