backstroke

Từ điển WordNet v3.1 - WordNet Dictionary

I - noun

a swimming stroke that resembles the crawl except the swimmer lies on his or her back
• Hypernyms:
swimming stroke
• Part Meronyms:
flutter kick

II - verb

swim on one's back
• Derivationally related forms:
backstroker
• Topics:
water sport, aquatics
• Hypernyms:
swim
• Verb Frames:
- Somebody ----s