flutter kick
US /ˈflʌt.ər ˌkɪk/
UK /ˈflʌt.ər ˌkɪk/

1.
battement de jambes, ciseaux de jambes
a swimming kick in which the legs are extended straight back and moved up and down alternately with a slight bend at the knees
:
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She used a strong flutter kick to propel herself through the water.
Elle a utilisé un puissant battement de jambes pour se propulser dans l'eau.
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Learning the flutter kick is essential for freestyle swimming.
Apprendre le battement de jambes est essentiel pour la nage libre.