Live-one meaning

(idiomatic) Someone who is easily fooled, victimized, or ridiculed.
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(idiomatic) Someone who is eccentric, nonconformist, or otherwise peculiar.
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(idiomatic) A person, thing, or situation which is particularly interesting, noteworthy, or urgent.
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Origin of live-one

  • Possibly an allusion to hooking a particularly lively fish on a fishing line.

    From Wiktionary