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The phrase "erstwhile allies" is correct and commonly used in written English.
It refers to someone or a group of people who were once allies, but are no longer on friendly terms or have ended their alliance. Example: The two countries were erstwhile allies, but tensions and conflicts arose due to political differences, causing them to sever ties and become enemies.
Exact(60)
Desertion, their erstwhile allies answer.
Now the two erstwhile allies are not even on speaking terms.
Congress has recently offloaded several erstwhile allies, including the SP; re-enlisting them will be costly.
Certainly not out of a desire to restore his favour with America's erstwhile allies.
But there were signs that Mr. Saleh's hesitations were testing the patience of his erstwhile allies.
The sharpest criticisms of Morales have come from erstwhile allies, however.
Other erstwhile allies of Zarqawi have expressed similar misgivings about his approach.
So he switched allegiances to back the supporters of Hitler against his own erstwhile allies.
Their erstwhile allies, the Democrats, are prodding them to reward good teachers and get rid of bad ones.
Attacks by erstwhile allies have also been deadly for American troops in Iraq during that eight-year war.
But the olive branch he held out to the Canadians and the rest of America's erstwhile allies was purely rhetorical.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com