jump the gun

The same question, asked 2 times: 20 Jul 2023 S1*, 11 Sep 2024 S2. Every wording below, oldest first.

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Question 1
20 Jul 2023 S1
86 $Select the most appropriate idiom for the given situation. I was very excited about my new assignment. I sent the email without the required attachment. What have I done?$
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Question 2
11 Sep 2024 S2
80 $Select the most appropriate meaning of the given idiom. Jump the gun$
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