Etymology
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manhole (n.)

also man-hole, "hole or opening in a floor, pavement, etc., through which a person may pass to gain access to certain parts for cleaning or repairing," 1793, from man (n.) + hole (n.).

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Definitions of manhole

manhole (n.)
a hole (usually with a flush cover) through which a person can gain access to an underground structure;
From wordnet.princeton.edu