Compare: 俯す vs 俯す
俯すうつぶす
to lie face down (e.g. on the ground, napping on a desk); to lie prone
俯すふす
to lower (one's head, gaze, etc.)
うつぶす俯す
N3Godan verb (su ending)
to lie face down (e.g. on the ground, napping on a desk); to lie prone
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