price war
US /ˈpraɪs wɔːr/
UK /ˈpraɪs wɔːr/

1.
guerre des prix
a fierce competition in which retailers cut prices in an attempt to increase their share of the market
:
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The supermarket initiated a price war on essential goods.
Le supermarché a lancé une guerre des prix sur les produits essentiels.
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Consumers often benefit from a price war as prices drop.
Les consommateurs bénéficient souvent d'une guerre des prix car les prix baissent.