to move along the surface of any body by slipping, or without walking or rolling; to slip; to glide; as, snow slides down the mountain's side.-especially, to move over snow or ice with a smooth, uninterrupted motion, as on a sled moving by the force of gravity, or on the feet.-to pass inadvertently.-to pass along smoothly or unobservedly; to move gently onward without friction or hindrance; as, a ship or boat slides through the water.-to slip when walking or standing; to fall.-to pass from one note to another with no perceptible cassation of sound.-to pass out of one's thought as not being of any consequence.-to cause to slide; to thrust along; as, to slide one piece of timber along another.-to pass or put imperceptibly; to slip; as, to slide in a word to vary the sense of a question.-the act of sliding; as, a slide on the ice.-smooth, even passage or progress.-that on which anything moves by sliding.-an inclined plane on which heavy bodies slide by the force of gravity, esp. one constructed on a mountain side for conveying logs by sliding them down.-a surface of ice or snow on which children slide for amusement.-that which operates by sliding.-a cover which opens or closes an aperture by sliding over it.-a moving piece which is guided by a part or parts along which it slides.-a clasp or brooch for a belt, or the like.-a plate or slip of glass on which is a picture or delineation to be exhibited by means of a magic lantern, stereopticon, or the like; a plate on which is an object to be examined with a microscope.-the descent of a mass of earth, rock, or snow down a hill or mountain side; as, a land slide, or a snow slide; also, the track of bare rock left by a land slide.-a small dislocation in beds of rock along a line of fissure.-a grace consisting of two or more small notes moving by conjoint degrees, and leading to a principal note either above or below.-an apparatus in the trumpet and trombone by which the sounding tube is lengthened and shortened so as to produce the tones between the fundamental and its harmonics.-a sound which, by a gradual change in the position of the vocal organs, passes imperceptibly into another sound.-same as guide bar, under guide.-a slide valve.