off the beam adv. or
adj. phr. 1. (Of an airplane) Not in the radio beam that marks the path to follow between airports; flying in the wrong direction.
A radio signal tells the pilot of an airplane when his plane is off the beam. 2. slang Wrong; mistaken.
Maud was off the beam when she said that the girls didn't like her. Antonym: ON THE BEAM.
[TahlilGaran] English Idioms Dictionary ▲