IPA: //ˈbiːtʃhɛd//
KK: /ˈbiːtʃhɛd/
A place on a shore that is taken by soldiers to help bring in more troops and supplies during an invasion.
The army established a beachhead to facilitate the landing of reinforcements.
Beachhead is formed from "beach" (from Old English *bæce*, meaning a pebbly shore or bank) and "head" (from Old English *heafod*, meaning the top or end). The term originally referred to a secured position on a beach from which military operations could be launched.
Picture a 'shore' ('beach') where you establish a 'position' ('head') to start your operations. This helps you remember that a beachhead is a secure area on the beach for launching further actions.