自作主张 act on one's own authority
Explanation
指未经授权或同意，擅自行动或决定。
To act or decide without authorization or consent.
Origin Story
从前，有个村庄里要修建一座水坝，村长召集村民开会商议。老张是村里有名的泥瓦匠，他自认为经验丰富，便自作主张，设计了一套方案，没有经过其他人的同意就立即开始动工。其他村民看到老张一个人在那里忙活，觉得方案不妥，但又不好意思直接提出反对，只好暗中观察。结果，老张设计的方案存在许多问题，水坝建好后不久就出现了裂缝，险些酿成大祸。这时，大家才意识到自作主张的危害，纷纷建议重新设计方案，吸取教训，最终顺利地修建了一座坚固耐用的水坝。
Once upon a time, there was a village that needed to build a dam. The village head called a meeting of the villagers to discuss it. Old Zhang, a renowned mason in the village, believed himself experienced and, without consulting others, designed a plan and immediately started work. Other villagers, seeing Old Zhang work alone, thought the plan inappropriate but hesitated to object directly, preferring to observe. Old Zhang's plan was flawed, and the dam, upon completion, soon developed cracks, nearly causing disaster. Then they realized the danger of acting independently and suggested a new plan, learning from their mistakes, finally building a sturdy, reliable dam.
Usage
作谓语、宾语；指未经许可擅自做主。
Predicate, object; refers to making decisions without permission.
Examples
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他自作主张地改变了计划。
tā zì zuò zhǔ zhāng de gǎibiàn le jìhuà
He unilaterally changed the plan.
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不要自作主张，先征求大家的意见。
bùyào zì zuò zhǔ zhāng, xiān zhēngqiú dàjiā de yìjiàn
Don't act unilaterally, first seek everyone's opinion..