Straight regulation? (4)
I believe the answer is:
rule
This might be a double definition.
'straight' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'regulation?' is the second definition.
(I know that regulation can be written as rule)
Can you help me to learn more?
(Other definitions for rule that I've seen before include "Regulation, reign" , "Govern the straight edge?" , "Control, government" , "Dominion" , "Control; printed line" .)