Originally military term, suggesting strategic advance or control within contested territory. The troops managed to secure a bridgehead, giving them an advantage in the battle.
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Not Literal
'Bridgehead' doesn't always mean a physical space; it can refer to an advantageous position. Capturing the communications center created a psychological bridgehead.
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Preparation Stage
A bridgehead often indicates a preparatory stage for further action or expansion. Once we've formed a bridgehead, we'll bring in more troops for the offensive.