The visible horizontal line (in all directions) where the sky appears to meet the earth in the distance.

A thing that causes horror; a terrifying thing, particularly a prospective bad consequence asserted as likely to result from an act.

Causing horror; terrible; shocking. / Tremendously bad.

An apparatus for gymnastic exercises with a cylindrical body covered with leather and two upright pommels, as hand grips, near the centre; held upright with adjustable legs.

(aviation) An instrument that displays the pitch and roll of an aircraft in flight by comparing its attitude to a gyroscopically-maintained indication of the flat horizon line.

(gymnastics) An apparatus with an upholstered body but no pommels; since about 2000 replaced with vault, also called vaulting table.

(idiomatic) On the telephone.

(idiomatic) To persist or continue far beyond any purpose, interest or reason.

(Britain, idiomatic) To attempt to get more out of something that cannot give more; to attempt to arouse fresh interest in something that is either hopeless or already settled.

You can show someone how to do something, but you can't make them do it.