Longman Dictionary of Contemporary English homepage

beam

1 noun
     
beam1 [countable]
1
a) a line of light shining from the sun, a lamp etc:
the beam of a powerful flashlight
b) TP a line of light, energy etc that you cannot see:
a laser beam
2TBC a long heavy piece of wood or metal used in building houses, bridges etc
3 a wide happy smile:
a beam of delight
4

off beam

British English informal incorrect or mistaken:
Our guesses were way off beam.
5DSO a balance beam
6TTW technical the widest part of a ship from side to side

➔ broad in the beam

at broad1 (1)

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