out-of-sight

[ out-uh v-sahyt ]
/ ˈaʊt əvˈsaɪt /

adjective

Slang. fantastic; great; marvelous: an out-of-sight guitarist.
beyond reason; exceedingly high: out-of-sight hospital bills.
Also out-a-sight.

Origin of out-of-sight

An Americanism dating back to 1895–1900