1946 in the musical sense, from blues (n.1) + -y (2).
blue-nose
blue-plate
blueprint
blues
bluestocking
bluesy
bluff
bluffing
bluffs
bluish
blunder
)window.location='https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=byronic106@yahoo.com&lc=US&item_name=Donation+to +Help+Keep+Etymonline+Free+and+Open&no_note=0&cn=&curency_code=USD&bn=PP-DonationsBF:btn_donateCC_LG.gif:NonHosted'){kind=link}