Shortened form of "get the lead out of one's shoes" (or one's pants). Here, "lead" refers to the metal that is very heavy, thus the expression means roughly "get rid of whatever is slowing you down and hurry up".
Modern English dictionary
Explore and search massive catalog of over 900,000 word meanings.
Word of the Day
Get a curated memorable word every day.
Challenge yourself
Level up your vocabulary by setting personal goals.