sliding

Concise Oxford English Dictionary © 2008 Oxford University Press:
slide/slʌɪd/

▶verb (past and past part. slid)

• 1 move along a smooth surface, especially downwards, while maintaining continuous contact with it.

• 2 change gradually to a worse condition or lower level.

▶noun

• 1 a structure with a smooth sloping surface for children to slide down.

  ■ a smooth stretch of ice or packed snow for sliding or tobogganing on.

• 2 an act of sliding.

  ■ a part of a machine or instrument that slides.

• 3 a rectangular piece of glass on which an object is mounted or placed for examination under a microscope.

• 4 a mounted transparency, especially one placed in a projector for viewing on a screen.

• 5 Brit. a hairslide.

– derivatives
slidable adjective,
slidably adverb.

– origin OE slīdan (v.); rel. to sled and sledge1.