to lower flags and silence drums (originally referring to hiding military movements); figuratively, to cease an activity or reduce one's momentum/influence; to calm down or quiet down.
经过一番激烈的争论，双方终于偃旗仆鼓，同意暂时休战。
After a heated debate, both sides finally lowered their flags and silenced their drums, agreeing to a temporary truce.
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