The most important factor; the principal point of focus or consideration; (also, with preceding possessive) individual preoccupation, talent, or contribution.
Origin
Early 17th century; earliest use found in John Webster (d.?1638), poet and playwright.
Definition of main thing in US English:
main thing
noun
The most important factor; the principal point of focus or consideration; (also, with preceding possessive) individual preoccupation, talent, or contribution.
Origin
Early 17th century; earliest use found in John Webster (d. ?1638), poet and playwright.