G'day again GUEST,Q,

"... but "pig" for policeman is there in a dictionary of 1854. ..."

Actually, "Pig" = A police officer ... a Bow Street officer ... &c appears in the 1811 Dictionary of the Vulgar Tongue, London - based on Capt. Francis Groses' 1785 original ... as does "Screw" = To copulate ... a female prostitute ... &c.

These are typical examples of older English slang preserved in an ex-colonial country, such as America ... when they have been long-forgotten in their country of origon. Most English regard them as "American neologisms", which they first saw in American novels from the 1930s on.

Regards,

Bob Bolton