1. past tense of mainline: to inject a drug directly into a major vein
Usage: slang; drug-related
2. past tense of mainline: to consume or use something in large quantities or as a primary focus
Usage: informal

Examples

• The documentary showed how addiction progressed when users mainlined heroin.
• He mainlined coffee all morning to stay awake for the exam.
• She mainlined news coverage during the election week.
• The patient had mainlined the medication before doctors could intervene.
• They mainlined energy drinks throughout the gaming tournament.
• The addict mainlined drugs for years before seeking treatment.