Pull out all the stops：To deploy all the resources or force at one’s disposal （竭尽全力、全力以赴）
例句：An over-worked marketing department had pulled out all the stops to get everything ready. （例句出处：《剑桥BEC高级真题集第四辑：P101》）
词义来源：An allusion to organ stops, which are pulled out to turn on each set of sounds in a pipe organ. When all stops are pulled out, the organ will play all variations of its sounds at once, therefore being as loud as possible.
类似表达：running at full capacity或running on full cylinders