noun
bridgehead; beachhead
Military term for a fortified position on the enemy side of a river or shore, used as a base for further operations. Also used figuratively for a foothold or starting point in a new area.
連合軍は川の対岸に橋頭堡を築いた。
The allied forces established a bridgehead on the opposite bank of the river.
その企業は海
The company set up a local subsidiary as a bridgehead into the overseas market.