Dictionary.com
definitions
  • synonyms

mainliner

[meyn-lahy-ner, -lahy-]
See more synonyms on Thesaurus.com
noun
  1. Slang. a person who mainlines.
  2. a person who belongs to a mainline group.
Show More

Origin of mainliner

An Americanism dating back to 1930–35; mainline + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018