She was accused of fraternizing with the enemy.

她被指责亲敌。

《牛津词典》

The general tried to avoid an engagement with the enemy.

将军竭力避免与敌军交火。

《牛津词典》

The soldiers were engaged in hand-to-hand combat with the enemy.

战士们与敌人展开了肉搏。

《新英汉大辞典》

Bourke-White flew with American bomber planes in England as they prepared to attack enemy targets on the European continent.

VOA: special.2009.05.17

You want to get through that as fast as you can, and engage with the enemy.

你想尽可能快地摆脱这些,与你的敌人交战

耶鲁公开课 - 古希腊历史简介课程节选

And the reinvention in the nineteenth century of British identity will also have a lot to do with fear of the Irish, "The enemy within," As they were perceived.

十九世纪英国民认同感的重建,和对爱尔兰的惧怕也有很大关系,"家贼难防",他们是这样看待爱尔兰的

耶鲁公开课 - 欧洲文明课程节选

Yet jumping into bed with the enemy would horrify supporters of more radical groups, such as Greenpeace.

ECONOMIST: The defence of nature 2

Texan Daniel Snow, a onetime insurance salesman, was charged with a more heinous crime: trading with the enemy.

FORBES

No battle plan survives the first contact with the enemy, according to German Field Marshal Helmuth von Moltke.

FORBES: A New Year, A New Business Plan -- Now What?