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Janelle jumped at the excuse to ignore her suitcases and searched the pockets of her jeans until she found the key. She then bounded to the front door, giving a smack to the cedar sign that bore the cabin’s name.

Comments  

In order to give you an accurate, complete and verifiable answer, I had to look the phrase up online and copy and paste a definition and a link to it. You can do this yourself. Let me walk you through it.

1. Go to the website Onelook ( https://www.onelook.com/ ).

2. Enter your word or phrase in the search box.

2. Scan the list of results for your dictionary of choice. The first one is often sufficient, and it is this time. I use Merriam-Webster.com for quick look-ups, and they list many expressions.

3. Click on the link.

4. Peruse the entry for a definition that makes sense in your context, and voila!

jump at - "to eagerly take (a chance, offer, etc.)" ( https://www.merriam-webster.com/dictionary/jump%20at )