He can claim to have been defeated by opponents copying his own tactics.

他可能会宣称他已经被模仿他策略的对手打败了。

《柯林斯英汉双解大词典》

We must recognize that we have been defeated.

我们必须承认我们被击败了。

youdao

Otherwise we would not have been defeated so easily.

否则我们不会输得这样快。

youdao

The Union army there had just been defeated in a battle along a little river called the Chickamauga.

VOA: special.2009.11.26

Satan and the rebel angels have been roundly defeated.

撒旦和叛乱天使们被彻底击败了。

耶鲁公开课 - 弥尔顿课程节选

He had been defeated by Benjamin Harrison.

VOA: special.2010.06.17

But in July, reports surfaced that the services' upgraded CAPTCHAs had also been defeated.

FORBES: Magazine Article

Bob Dole, he's never been defeated for the Senate when he ran for president in 1996.

NPR: Political Junkie: Clinton, Lieberman and Holder

Deflation has not yet been defeated: consumer prices fell by 0.4% in the year to December.

ECONOMIST: Taking the porridge test