water rat
US /ˈwɑːtər ræt/
UK /ˈwɑːtər ræt/

1.
rat d'eau, campagnol terrestre
a large vole (Arvicola amphibius) that lives in or near water and has a short tail and small ears, native to Europe and Asia
:
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The water rat quickly dived into the river.
Le rat d'eau a rapidement plongé dans la rivière.
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We spotted a water rat building its burrow by the stream.
Nous avons aperçu un rat d'eau construisant son terrier près du ruisseau.
2.
rat d'eau, passionné d'eau
a person who spends a lot of time in or on the water, especially swimming or boating
:
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He's a real water rat, always out on his kayak.
C'est un vrai rat d'eau, toujours sur son kayak.
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The kids are such water rats; they spend all summer at the pool.
Les enfants sont de vrais rats d'eau ; ils passent tout l'été à la piscine.