na-adjective, noun
headlong; head over heels; upside down
Describes falling or tumbling in a headfirst or inverted manner. Often used with verbs like 落ちる (to fall) or 転ぶ (to tumble).
See also: まっさかさま
彼は階段から真逆様に落ちた。
He fell headlong down the stairs.
木から真逆様に落ちて怪我をした。
I fell head over heels from the tree and got injured.
A more emphatic or colloquial variant with the same meaning; often used in spoken Japanese.
Compound of 真 (ma, 'true') + 逆様 (sakasama, 'inverted, upside down'). The reading まさかさま is a straightforward combination.