unplumb1
/(ˌ)ʌnˈplʌm/adjective
Not plumb: (literal ) not vertical or straight; ( figurative ) not true or upstanding.
Origin
Early 19th century; earliest use found in Thomas Carlyle (1795–1881), author, biographer, and historian. From un- + plumb.
unplumb2
/(ˌ)ʌnˈplʌm/verb
[with object] To disconnect (a toilet, washing machine, etc.) from a water supply and drain.
Origin
Late 18th century (in an earlier sense). From un- + plumb.