From Chinese 茶 (chá), from Proto-Sino-Tibetan *s-la, via two routes: in some cases from Hindustani चा (cā) / چا (cā) (a variant of the same root, from Persian چا, which led to chai), from Northern Chinese; in other cases from 茶 (chá) /t͡sʰɑː²¹/, the pronunciation found in Canton (Guangzhou), where the British bought much of their tea in the 19th century. Doublet of tea, which is from the Amoy Min Nan pronunciation tê.
Meanings
(uncountable) Tea, (sometimes dialect) specifically masala chai.
Would you like a cup of cha?
[Krazy Kat, bringing a full tray:] Look, folkses – hot dogs, hot cha, hot peppa pots, hot timollies – hot kuffy. ^([sic]) 1934 August 4, George Herriman, Krazy Kat, Saturday, comic strip, →ISBN, page 206: