sake (n.1)

"purpose," Old English sacu "a cause at law, crime, dispute, guilt," from Proto-Germanic *sako "affair, thing, charge, accusation" (source also of Old Norse sök "charge, lawsuit, effect, cause," Old Frisian seke "strife, dispute, matter, thing," Dutch zaak "lawsuit, cause, sake, thing," German Sache "thing, matter, affair, cause"), from PIE root *sag- "to investigate, seek out" (source also of Old English secan, Gothic sokjan "to seek;" see seek).

Much of the word's original meaning has been taken over by case (n.1), cause (n.), and it survives largely in phrases for the sake of (early 13c.) and for _______'s sake (c. 1300, originally for God's sake), both probably are from Norse, as these forms have not been found in Old English.

sake (n.2)

"Japanese rice liquor," 1680s, from Japanese sake, literally "alcohol."

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Definitions of sake from WordNet

sake (n.)
a reason for wanting something done;
for your sake
died for the sake of his country
Synonyms: interest
sake (n.)
Japanese alcoholic beverage made from fermented rice; usually served hot;
Synonyms: saki / rice beer
sake (n.)
the purpose of achieving or obtaining;
for the sake of argument