(slang) A .44 Magnum handgun

The cardinal number immediately following thirty-three and preceding thirty-five.

The cardinal number immediately following ninety-three and preceding ninety-five.

(baseball) A four-seam fastball.

(baseball, slang) A home run.

(idiomatic, derogatory) A person who wears spectacles.

Alternative spelling of four-eyes

(Canada, slang) A case of twenty-four bottles or cans of beer.

(chiefly Canada, US) A length of sawn wood of cross section approximately 2 inches by 4 inches, most often employed as structural framing lumber (dimension or dimensional lumber).

(In both the 12-hour clock and the 24-hour clock) The start of the fifth hour of the day; 4:00 a.m. (04:00). / (Only in the 12-hour clock) The start of the seventeenth hour of the day; 4:00 p.m. (16:00).