somewhen [ˈsʌmhwɛn], adv. Also 4 somwanne, sumwhan(ne.
Etymology: f. some a.[entry#1] + when adv.
At some (indefinite or unknown) time; sometime or other. Common in 19th cent. Usu. coupled with somewhere or somehow.
1297 R. Glouc. (Rolls) 5212 - Of þe batayles of denemarch þat abbeþ ybe in þis londe... Worst hii were, vor oþere somwanne adde ydo [etc.].
1833 J. S. Mill Let. 5 July in Wks. (1963) XII. 163, - I shall write out my thoughts more at length somewhere, and somewhen, probably soon.