(chiefly, Canada) A type of screwdriver having a square tip, designed to drive a Robertson screw.
The Robertson-head screw has a square hole in the head, made in three different sizes, and must be driven with a special Robertson screwdriver.
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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.
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