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English word suppeth comes from English sup, English -eth
sup (English)
To take supper. (informal) Superintendent. (slang) what's up (either as a greeting or actual question) (mathematics) Upper limit. (physics) Being or relating to the squark that is the superpartner of an up quark. To sip; to take a small amount of food or drink into the mouth, especially with a spoon. A sip; a small amount of food or drink.
-eth (English)
Used to create ordinal numbers from cardinal numbers ending in -y, namely the multiples of ten (other than ten itself): 20, 30, 40, 50, 60, 70, 80, and 90; e.g. twentieth, thirtieth. (archaic) Used to form the third-person singular present indicative of verbs.. (humorous) replaces -s or -es (of verb forms and noun plurals), or is appended to other verb forms, forming nonce, pseudoarchaic [...]
suppeth (English)
(archaic).