A person who is very easy to defeat, convince, or manipulate because they don't resist or stand up for themselves.
Compound word from 'push' (to apply force) and 'over' (to knock down). The term emerged in American English in the early 20th century, literally describing someone who could be knocked down with a push, then metaphorically applied to someone easily overcome.
In video games and sports, 'pushover' opponents were so predictable that defeating them taught players nothing—which is why facing a pushover is ultimately boring despite being easy, revealing that challenge and satisfaction are mysteriously linked.
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