/ ˈsuːpaɪn; NAmE ; BrE also ˈsjuː-/ adjective ( formal )
1.
lying flat on your back :
a supine position
—compare prone
2.
( disapproving ) not willing to act or disagree with sb because you are lazy or morally weak
► su·pine·ly adverb
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WORD ORIGIN
late Middle English : the adjective from Latin supinus bent backwards (related to super above); the noun from late Latin supinum , neuter of supinus .