boot drop
n.— «In Marine parlance, Nice was a “boot drop”—someone who had just joined the unit from basic training.» —“Death, duty in forgotten corner of war” by Doug Struck in Qaim, Iraq MSNBC Aug. 13, 2004. (source: Double-Tongued Dictionary)
Further reading
If you speak a second or third language, you may remember the first time you dreamed in that new tongue. But does this milestone mean you’re actually fluent? And a couple’s dispute over the word regret: Say you wish you’d been able...
A flashlight doesn’t flash. It provides a steady beam of light. So why is it called a flashlight? The earliest versions lit up only briefly before the batteries gave out and required a recharge, so they were literally “flash lights...