on the beam
on the beam {adv.} or {adj. phr.}
1. (Of an airplane) In the radio beam that marks the path to follow between airports; flying in the right direction.
A radio signal tells the pilot of an airplane when he is flying on the beam.
2. {slang}
Doing well; just right; good or correct.
Kenneth's answer was right on the beam.
Contrast: OFF THE BEAM.
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Source: A Dictionary of American Idioms
