Encara no tenim significats per a "prove a boomerang".
1Sometimes, however, the story may prove a boomerang in the most unexpected way.
2That's why I say submarine activities off the American coast will prove a boomerang to the foe.
3Virginia's sarcastic comment had proved a boomerang and she had gained nothing by launching it.
4"Poor Mr. Cardington's olive branch has proved a boomerang to himself, I fear."
5"That ghost business proved a boomerang," was Tom's comment.
6"That's true," said Frank, "but at the same time such an attack might prove a boomerang to the Germans."
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