"lowest possible," 1884, from noun (1815), from rock (n.1) + bottom (n.).
robust
roc
rock
rock and roll
rockabilly
rock-bottom
rock-candy
Rockefeller
rocker
rocket
rocketry
)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}