"sussed out" meaning in English

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          "ref": "1995, Radiohead (lyrics and music), “High and Dry”, in The Bends, performed by Radiohead, track 2:",
          "text": "Drying up in conversation / You will be the one who cannot talk / All your insides fall to pieces / You just sit there wishing you could still make love / They're the ones who'll hate you / When you think you've got the world all sussed out / They're the ones who'll spit at you / You will be the one screaming out",
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