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1.
a short way to say "For some reason"
Somewhy, I'm really tired today.
by Marco St. John November 15, 2007
 
2.
in relation to somewhat, which would indicate 'to a certain extent', somewhy means 'for some reason'
A: go get me the thing from the place

B: *retrieves soda from refrigerator*

A: somewhy you understood that; thanks
by shirimasen August 18, 2010