To place persons or things along the side of for security or defense; to strengthen by adding anything; to fortify; as, to line works with soldiers.

A straight row; a continued series or rank; as, a line of houses, or of soldiers; a line of barriers.

The direction in which the player intends the ball to travel after it is hit. In most cases, the correct line is a straight one. It often happens, however, that the line is different for two players, particularly if one is a longer hitter than the other.

A mental line of travel you want the car to take to maximize speed through the turns, and ultimately the whole course. Try to pick a line that causes the least amount of turning the wheel, maximizes straightaways, and minimizes time the car is not traveling in a straight line. This is usually determined when walking the course before the event.

The set of rules used to calculate results and payout of straight wagers. Could also refer to a specific event and the line collectively.

1) A specific physical space for the manufacture of a product that in a flow shop layout is represented by a straight line. In actuality, this may be a series of pieces of equipment connected by piping or conveyor systems. 2) A type of manufacturing process used to produce a narrow range of standard items with identical or highly similar designs. Production volumes are high, production and material handling equipment is specialized, and all products typically pass through the same sequence of operations. See: assembly line.

The lines used to divide and vary fields and charges in heraldry are by default straight, but may have many different shapes. (Care must sometimes be taken to distinguish these types of lines from the extremely unusual and non-traditional use of lines as charges,http://www.tioh.hqda.pentagon.mil/Cav/91CavalryRegiment.htm and to distinguish these shapes from actual charges, such as "a mount [or triple mount] in base," or, particularly in German heraldry, different kinds of embattled from castle walls.)