From Middle English ithand, an alteration (due to assimilation to suffix -and) of ithen, from Old Norse iðinn ("assiduous, diligent"), from iðja, iðna, from ið, equivalent to ithe + -and and/or ithe + -en. Cognate with Icelandic iðinn ("diligent"), Norwegian idig ("busy"), Danish idelig ("continual"), and perhaps to English eddy.
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