floating on one's back
Refers to the act of floating face-up in water, often used in swimming or survival contexts.
I practiced floating on my back in the pool.
Standard kanji spelling for this term.
Variant spelling without okurigana; less common but still encountered.
Compound of 浮き (uki, 'floating') + 身 (mi, 'body'). The exact historical derivation is uncertain, but the spelling is conventionally associated with the meaning of floating on one's back.