A person who pays tithes.
In early use frequently with preceding qualifying adjective, as false, small, true, etc.
Late Middle English; earliest use found in Geoffrey Chaucer (c1340–1400), poet and administrator. From tithe + -er.
A state of nervous excitement, agitation, or anxiety. Chiefly in (all) in a tither, (all) of a tither.
Late 19th century; earliest use found in Black and White. Origin uncertain; perhaps a variant of dither.