slip¹ (slĭp)

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[Middle English slippen, probably of Middle Low German or Middle Dutch origin.]

verb: slipped, slip·ping, slips. 

intransitive verb 

1. 1. To move smoothly, easily, and quietly: slipped into bed.
   2. To move stealthily; steal.
2. To pass gradually, easily, or imperceptibly: “It is necessary to write, if the days are not to slip emptily by” (Vita Sackville-West)
3. 1. To slide involuntarily and lose one's balance or foothold. See synonyms at slide
   2. To slide out of place; shift position: The gear slipped.
4. To escape, as from a grasp, fastening, or restraint: slipped away from his pursuers.
5. To decline from a former or standard level; fall off.
6. To fall behind a scheduled production rate.
7. To fall into fault or error. Often used with up.

transitive verb 

1. To cause to move in a smooth, easy, or sliding motion: slipped the bolt into place.
2. To place or insert smoothly and quietly.
3. To put on or remove (clothing) easily or quickly: slip on a sweater; slipped off her shoes.
4. To get loose or free from; elude.
5. To give birth to prematurely. Used of animals.
6. To unleash or free (a dog or hawk) to pursue game.
7. To release, loose, or unfasten: slip a knot.
8. To dislocate (a bone).
9. To pass (a knitting stitch) from one needle to another without knitting it.

noun 

1. The act or an instance of slipping or sliding.
2. An accident or mishap, especially a falling down.
3. 1. An error in conduct or thinking; a mistake.
   2. A slight error or oversight, as in speech or writing: a slip of the tongue.
4. Nautical
   1. A docking place for a ship between two piers.
   2. A slipway.
5. Nautical The difference between a vessel's actual speed through water and the speed at which the vessel would move if the screw were propelling against a solid.
6. 1. A woman's undergarment of dress length with shoulder straps.
   2. A half-slip.
7. A pillowcase.
8. Geology
   1. A smooth crack at which rock strata have moved on each other.
   2. A small fault.
   3. The relative displacement of formerly adjacent points on opposite sides of a fault.
9. The difference between optimal and actual output in a mechanical device.
10. Movement between two parts where none should exist, as between a pulley and a belt.
11. A sideways movement of an airplane when banked too far.

idioms

give (someone) the slip

To escape the pursuit of.

let slip

To say inadvertently.

slip one over on

To hoodwink; trick.

slip² (slĭp)

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[Probably from Middle Low German, or Middle Dutch slippe.]

noun 

1. A part of a plant cut or broken off for grafting or planting; a scion or cutting.
2. A long narrow piece; a strip.
3. A slender youthful person: a slip of a child.
4. A small piece of paper, especially a small form, document, or receipt: a deposit slip; a sales slip.
5. A narrow pew in a church.

transitive verb: slipped, slip·ping, slips. 

To make a slip from (a plant or plant part).

slip³ (slĭp)

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[Middle English, slime, from Old English slypa.]

noun 

Thinned potter's clay used for decorating or coating ceramics.

SLIP (slĭp)

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abbreviation 

Serial Line Internet Protocol