steal a march on
Gain an advantage over unexpectedly or secretly, as in Macy's stole a march on their rival department store with their Thanksgiving Day parade. This metaphoric expression comes from medieval warfare, where a march was the distance an army could travel in a day. By quietly marching at night, a force could surprise and overtake the enemy at daybreak. Its figurative use dates from the second half of the 1700s.
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