1. a tall military cap with a plume or pompom, typically worn by certain regiments
Usage: military; historical

Examples

• The soldier’s shacko gleamed with its brass fittings.
• The regiment was distinguished by their red-plumed shackos.
• He adjusted his shacko before the parade began.
• The museum displayed various military shackos from different eras.
• Her ancestor’s shacko was preserved as a family heirloom.