Definition of main beam in English:

main beam

Line breaks: main beam

Entry from British & World English dictionary

noun

1A principal beam which transmits a load directly to a column.
2British The full (rather than dipped) beam of the headlights of a motor vehicle: headlights were good, particularly on main beam

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Pronunciation: ˈsɛmbləns
noun
the outward appearance or apparent form of something…