qiào = qi + ao4
hole / opening / orifice (of the human body) / (fig.) key (to the solution of a problem)
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窍 character breakdown

qiǎo = qi + ao3
opportunely / coincidentally / as it happens / skillful / timely
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xué = xu + e2
cave / cavity / hole / acupuncture point / Taiwan pr. [xue4]
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