take upon have one´s own way of doing things act on one´s own decide all by oneself decide for oneself instead of consulting others
You can´t do it on your responsibility.
你不能自作主张地做那件事。
—— 给力词典精选I don´t like the cool way you used my bicycle without my permission.
我不喜欢你这种擅自使用我的自行车的自作主张的行为。
—— 辞典例句He could no longer be arrogant, masterful, acting upon his own judgement , independent of opinion.
他不再趾高气扬,盛气凌人, 独断独行, 自作主张了。
—— 辞典例句Only he who has true faith is secure against presumption.
只有具备了真正的信心,才能确保不自作主张。
—— 给力词典精选Must we really account for our boldness in coming here?
难道我们真的必须说明为什么自作主张到这儿来 吗 ?
—— 给力词典精选