名詞 breaststroke:

1. a swimming stroke; the arms are extended together in front of the head and swept back on either side accompanied by a frog kick

動詞 breaststroke:

1. swim with the face down and extend the arms forward and outward while kicking with the leg

1. He can swim breaststroke, backstroke and crawl.
   他會游蛙泳、仰泳和自由泳。

breast.stroke

n.Sports （名詞）【體育運動】
A swimming stroke in which a person lies face down in the water and extends the arms in front of the head, then sweeps them both back laterally under the surface of the water while performing a frog kick.
蛙泳：泳者臉朝下浸入水中，把兩臂伸向頭的前方，然后在水面下從側面把兩臂收回，同時象青蛙一樣蹬腳的一種泳姿

【引伸】
breast.stroke.
v.（動詞）
breast.strok.er
n.（名詞）