11th President of the United States; his expansionism led to the Mexican War and the annexation of California and much of the southwest (1795-1849)
"Polk's aggressive expansionist policies ultimately sparked the Mexican War."
To dance the polka.
"The couple moved quickly across the floor as they began to polk at the local festival."
A surname.
"Many famous musicians, such as Abraham Lincoln's stepfather, have been associated with the Polk family name."
The word "polk" originated as a Scottish and East German surname derived from the shortened forms of names like Pollock or Bolesław. Its roots trace back to Proto-Slavic terms meaning "army" or "crowd," which were adapted into various local surnames before entering English usage.