Pigeon-livered/lacking gall = timid, easily frightened
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fumigated
livered
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Golden-Livered Sky Newt
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Orbit Gum
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The phrase "thou art a lily-livered boy" is an insult implying that someone is cowardly or lacking courage. It suggests that the person is weak-willed or easily frightened, similar to the connotation of being timid or spineless.