American Dictionary

Define dictionary terms easily in our powerful online English dictionary.

Searching for...

No matching words found

Try a different search term or browse the dictionary

Definition mainline in American English

mainline verb

[intransitive/transitive] verb
/ˈmeɪnˌlaɪn/
1

to do, eat, or take too much of something

Example

We stayed up mainlining junk food and watching TV.

Synonyms and related words
2

to put illegal drugs into your blood using a needle

Synonyms and related words
Definition mainline in American English