Geez

ˀəska - until, till, unto, as far as, so much so, up to, to the point of, even also, within, for (CDG 42)

See Lipiński 1997:464.

PS
*ˀiš - to, for (Arakelova 2001:29)
The reconstruction is not entirely certain. Akk. iš is only attested in a specific group of texts (the archaic liver models from Mari); moreover, it is sometimes considered to be an equivalent of the terminative marker -iš. Throughout EthS this preposition can only be distinguished as a part of other prepositions, for which one may also suppose other ways of division. See Arakelova 2001:29–30.