Wiktionary
vb. To leave an elevated position to a lower position by one jump.
Wikipedia
"Jump Down" is a song by Irish girl group B*Witched, released as their seventh single. It was released on 20 March 2000 as the third and final single from their second studio album Awake and Breathe (1999). It became their lowest chart peak in the UK Top 40, reaching number 16.
Usage examples of "jump down".
I'm going to jump down, Lenny, and get around under your fore scanner pickup.
Feeling tense and stale after so much delicate work, I decided to jump down to 1105, while my people slept, and drop in on Metaxas.
But you can't jump down the line to August, 2059, nor can you jump to 2159 or 20590.
At the time we left Vervain Station they were still putting the Rangers' failures to defend the Cetagandan-side jump down to incompetence.
The top of the gunwale, amidships where we were, was riding just level with the jetty and all we had to do was jump down the thirty inches to the deck below.
Even assuming Vanis D'arl didn't jump down our throats for doing it, would you really want to tell people Jonny has no control over his combat reflexes?
To his credit he didn't jump down Terry's throat as all three of her superior officers would have bet hard credits he would.