(construction, North America) A passer-by or other person who watches and possibly advises work at a construction project from a sidewalk or other vantage point.
Even the most occasional sidewalk superintendent knows that in the construction of a tall building the first floor is put in before the second, the second before the third, and so on.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.