A matsayin fi’ili, “mainline” na iya samun ‘yan ma’anoni daban-daban, dangane da mahallin:(slang) Don allurar magani kai tsaye cikin jijiya. > Don haɗa wani abu kai tsaye zuwa babban layi, kamar famfo ko tsarin lantarki. Don sanya wani abu ya zama na tsakiya ko na farko ko fifiko.As an adjective , "mainline" gabaɗaya yana nufin "na ko alaƙa da babban layi," kamar babban layin dogo ko magudanar ruwa.