Hello! Here, "wound up" is being used to imply that he "ended up" somewhere different from where he started. In this case, he ends up on the top wrung.

Anita W.
tutor
Wound up means ends or end up; the top rung implies the top step of stairs.
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03/13/24
John B.
Okay, thank you. Sometimes it is unreal to understand English03/09/24