From Middle English stack, stacke, stakke, stak, from Old Norse stakkr ("a barn; haystack; heap; pile"), from Proto-Germanic *stakkaz ("a barn; rick; haystack"), from Proto-Indo-European *steg- ("pole; rod; stick; stake"). Cognate with Icelandic stakkur ("stack"), Swedish stack ("stack"), Danish stak ("stack"), Norwegian stakk ("stack"). Related to stake and sauna.
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