"Well, "though" has had its alternative spelling of "tho" since
way back in the 15th century (and the OED hints that it may go
back to the 11th Century). And it's a heckuva lot more sensible
way to spell it. ;-) "

I think it may precede the 15th century but not by a lot. Methinks it
became more common during some of the Renaissance and Shakespeare writing
eras.

I've always been a fan of words, spoken or written. I also like the
sillyness of some such as
Gallagher's comments on "bomb" "tomb" and "comb".

Bill

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"Two wrongs don't make a right, but three lefts will"
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"Stupidity is believing much, while understanding little"
....Charles A. Meyers