To act at one's discretion; to handle matters expediently according to the specific circumstances, without needing to seek prior instructions or approval.
经理出差前告诉小王，如果遇到突发情况，可以便宜行事，不必事事汇报。
Before the manager left for his business trip, he told Xiao Wang that in case of an unexpected situation, he could act on his own discretion without reporting every single detail.
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