headfirst

adverb

with the head foremost
頭を先にして
- the runner slid headlong into third base
  向こう見ずに三塁に滑り込んだランナー

adjective

with the head foremost
真っ逆さまに
- a headfirst plunge down the stairs
  階段を真っ逆さまに飛び降りること
- a headlong dive into the pool
  プールへの真っ逆さまの飛び込み

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