a branch of the Tai languages
"The Tho language is spoken by communities in northern Thailand and belongs to the Tai linguistic family."
Then; thereupon.
"I wanted to go out, but it was raining so I stayed in tho."
Alternative spelling of though
In plain English: Tho is an informal way of saying though, used to add a contrasting idea at the end of a sentence.
"I wanted to go for a walk, but it rained so I just stayed home tho."
The (plural form); those.
"The old tho in that corner needs to be replaced soon."
Those; they.
"The data shows that tho results are consistent across all regions."
When.
"I'll be there tho you arrive late."
Tho comes from the Old English word for "those," which originally meant nothing more than a demonstrative pronoun referring to specific people or things. Over time, this form evolved into Middle English and eventually became the modern contraction used before words beginning with vowels.