Wave
What part of a tsunami do you feel with your skin? The waves. Tsunamis are accompanied by all kinds of terrifying sights and sounds, but what you feel on your skin are the powerful waves.
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なみ
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When each wave hits your body, you shout, "Hah (は)!" It's not like it's on purpose. When the wave crashes into you, the wind gets knocked right out of you, making you say "Hah!"