verb

• (intransitive) To lose one’s traction on a slippery surface; to slide due to a lack of friction.
  "[...] but in the damp conditions prevailing the driver sensibly was unwilling to attempt the climb up through Combe Down tunnel without help, for fear of slipping to a standstill in the unventilated bore, […]"
• (intransitive) To err.
  "There is one that slippeth in his speach, but not from his heart, and who is he that hath not offended with his tongue?"
• (intransitive) To accidentally reveal a secret or otherwise say something unintentionally.
• (intransitive) To move or fly (out of place); to shoot; often with out, off, etc.
  "A bone may slip out of place."

noun

• (nautical) A berth; a space for a ship to moor.
• (nautical, aviation) A difference between the theoretical distance traveled per revolution of the propeller and the actual advance of the vessel.
• (nautical) A slipway.
• (medicine) A one-time return to previous maladaptive behavior after cure.

noun

• (obsolete) A descendant, a scion.
  "a native slip to us from foreign seeds"
• (marine insurance) A memorandum of the particulars of a risk for which a policy is to be executed. It usually bears the broker's name and is initiated by the underwriters.

noun

• (ceramics) A thin, slippery mix of clay and water.
  "The Wasserpfeife or water-whistle from Moravia was a bird whistle made during the seventeenth and eighteenth centuries. […] The bird is of a grey and brown mottled glaze with sgraffito markings and touches of green slip."
• (obsolete) Mud, slime.