I've thought さかさま to mean to rotate 180" over the X-axis. In dictionaries, I
see the definition "to invert, upside down; to flip" ok.

But " _to reverse, back to front_ " is also included in some dictionaries as a
"secondary" definition for さかさま。This seems strange.

In daily use Japanese, さかさま 99% of the time means "rotate over the X-axis and
turn something upside down. to invert / flip", right? And saying "さかさまにしろ" is
like telling someone to "stand on their head"?
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2019-12-17T00:52:18.263
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Does 逆さまにする ever mean rotation on the Y-axis? a twist?