shavetail

noun
shave·​tail | \ ˈshāv-ˌtāl How to pronounce shavetail (audio) \

Definition of shavetail

1 : a pack mule especially when newly broken in
2 usually disparaging : second lieutenant

First Known Use of shavetail

1846, in the meaning defined at sense 1

History and Etymology for shavetail

from the practice of shaving the tails of newly broken mules to distinguish them from seasoned ones

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