enemy lines
definitions
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The physical position, formation, or defensive boundary held by an opposing military force.ja: 敵陣
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The territory, social sphere, or area of influence controlled by an opposing group or ideology.ja: 敵陣営
examples
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The spy managed to slip past the enemy lines unnoticed.
スパイは敵陣を気づかれずに通り抜けることができた。
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The journalist felt like she was walking into enemy lines when she entered the rival political headquarters.
ライバル政党の本部に足を踏み入れたとき、そのジャーナリストは敵陣営に入り込んだような気分になった。