Mainline

/ˈmeɪnlaɪn/

verb

To inject a drug into your body with a needle.

The addict was mainlining heroin every day.

Informal, Disapproving

Colloquial

Definition 1 of 4

Pro Tip 1/2

Used to describe someone injecting drugs, usually illicit substances, directly into veins.

Celebrities who mainlined fell into serious health issues.

Pro Tip 2/2

Considered very informal and offensive in non-drug related discussions.

Never use 'mainline' casually in professional settings.

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