[civeng]

Where do people refer a "2x4" as a "4x2"? Sincere question.

I have heard it, but only in the way of inferring that it was being used in an abnormal or "flat" orientation, such as for a floor truss assembly

[Taniwha]

certainly here in NZ, Australia too I think

[Taniwha]

And the UK too:

https://www.buildingmaterials.co.uk/nuts-and-bolts/guides/4x...