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Phrase(s): *strong as a horse [and] *strong as an ox; *strong as a lion
Cliché [of a living creature] very strong. (*Also: as ~.) • Jill: My car broke down; it’s sitting out on the street. Jane: Get Linda to help you push it; she’s as strong as a horse. • The athlete was strong as an ox; he could lift his own weight with just one hand. • The football player was strong as a lion.
McGrawhill's American Idioms And Phrasal Verbs