(soccer) The official who keeps things at the dugout in order, and displays substitutions and the amount of injury time

(chiefly US) A cocktail containing one part grenadine syrup, one part vodka, and one part blue curaçao, reminiscent of the red, white, and blue colours of the United States flag, often poured in layers so that the colours do not mix when the drink is served.

The national holiday of Independence Day in the United States, celebrated on the fourth day in July to mark the anniversary of the signing of the Declaration of Independence from Great Britain in 1776.

(American football) The fourth down in a series that has a maximum of four downs; often used to punt the ball downfield or attempt a field goal (If not punted or converted, the opposing team takes possession wherever the ball is).

(medicine) The period from the birth of a baby to when the baby is about three months old.

(idiomatic) Full throttle; a maximal level of effort. / Used other than figuratively or idiomatically: see fourth, gear.

(Star Wars, fandom slang) Star Wars Day (May 4); the day fans celebrate Star Wars.

Used other than figuratively or idiomatically: see May, fourth.

Alternative form of happy Fourth of July

(music) A musical interval of the Western twelve-semitone system consisting of four semitones and spanning four degrees of the diatonic scale. It is one semitone narrower than a perfect fourth and enharmonically equivalent to a major third.