also: いっぽんぜおい
one-armed shoulder throw
A throwing technique in judo and sumo where the attacker grips one arm and throws the opponent over the shoulder. The term is also used metaphorically for a decisive move or winning argument.
He threw his opponent with a one-armed shoulder throw.
I was defeated by his decisive argument (lit. one-armed shoulder throw).
背負い投げ is a general shoulder throw, while 一本背負い specifically involves gripping one arm.
Standard kanji spelling; the reading いっぽんせおい is the most common.
Alternate reading with rendaku (voicing of せ to ぜ). Less common but still used.
Compound of 一本 (ippon, 'one arm' or 'one point') and 背負い (seoi, 'carrying on the back'), referring to the technique of throwing an opponent over the shoulder while holding one arm.