flutter kick

(swimming) A kick technique in which the swimmer kicks the legs alternately up and down for propulsion.

Japanese Meaning

水泳において、交互に脚を上下に動かして推進力を得る蹴りの技法（バタ足）

To improve speed, the coach told him to focus on his flutter kick.

スピードを上げるために、コーチは彼にバタ足に集中するように言った。

Sense（1）

(swimming) A kick technique in which the swimmer kicks the legs alternately up and down for propulsion.

flutter kicks

（ plural ）