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Definition of main beam in English: main beamnoun 1A principal beam which transmits a load directly to a column. Example sentencesExamples - The primary structure was a box beam, comprising two main beams.
- There are also unsafe parts of the building as the stairs have dry rot and the main beam is rusting badly.
- The curving involved one main beam and railing.
- All columns and main beams are 200 mm square laminated pine members, while secondary roof elements, roof linings and most other woodwork are made of untreated pine, the aroma of which permeates the whole complex.
- The piece cut off the frame is used for the main beam of the arch.
2British The brightest setting of a vehicle's headlights; full beam. headlights were good, particularly on main beam Example sentencesExamples - The full light output is used for the main beam and a shutter blocks off part of the light when a dipped beam is required.
- The lights are good on dip and brilliant on main beam with good spread coverage.
- It is not lit all the way, but because of the traffic you can never be sure whether you should dip your lights or have them on main beam.
- Mr Amor, of Great Cheverell, said: ‘I had my headlights on main beam when I saw something on the side of the road looking back at me.’
- Designed primarily for off-road use, the lamps operate only when main beam is selected, a literally brilliant safety extra when driving on country roads at night.
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