(intransitive) To decelerate. / (transitive) To reduce the velocity, speed, or tempo of something.

A slow-burning fuse used to ignite a matchlock musket or fire a cannon.

Lacking a keen or swift intellect, not too bright or not too swift.

slower than regular speed.

A technique of film, photography, and video to stretch time and allow visibility of things normally happening too fast to be conveniently examined.

An oven that is heated to a comparatively cool temperature, typically not more than 150 degrees centigrade or 300 degrees Fahrenheit.

(idiomatic, colloquial) To slow; to slow down; to decelerate.

Alternative form of slow as molasses in January

(simile) Extremely slow

(idiomatic) A gradually increasing feeling of anger or frustration. / (fiction, fandom slang) A romantic story (especially a work of fan fiction) in which the central relationship develops slowly.