Definition of beachhead noun from the Oxford Advanced Learner's Dictionary

 

beachhead

 noun
noun
BrE BrE//ˈbiːtʃhed//
 
; NAmE NAmE//ˈbiːtʃhed//
 
 
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a strong position on a beach from which an army that has just landed prepares to go forward and attack see also bridgehead Word Origin Second World War (originally US): formed on the pattern of bridgehead.
See the Oxford Advanced American Dictionary entry: beachhead