noun

• Meanings relating to a wind instrument.
  "Oh, Danny boy, the pipes, the pipes are calling From glen to glen, and down the mountain side, The summer's gone and all the roses falling, It's you, it's you must go and I must bide."
• Meanings relating to a wind instrument.
  "Most theater organs use many sets (ranks) of reed and flue pipes of various shapes, pipe scales, and so forth to generate a variety of timbres."
• Meanings relating to a hollow conduit.
  "A burst pipe flooded my bathroom."
• Meanings relating to a hollow conduit.
  "He grabs my legs and throws them over his shoulders, putting his big pipe inside me […]"

verb

• (ambitransitive) To play (music) on a pipe instrument, such as a bagpipe or a flute.
  "[T]he pide Piper with a ſhrill pipe went piping through the ſtreets, and forthwith the rats came all running out of the houſes in great numbers after him; all which hee led into the riuer of Weaſer and therein drowned them."
• (intransitive) To shout loudly and at high pitch.
  ""Ar—cher—Ja—cob!" Johnny piped after her, pivoting round on his heel, and strewing the grass and leaves in his hands as if he were sowing seed."
• (intransitive) To emit or have a shrill sound like that of a pipe; to whistle.
  "[W]ith the mariners A fellow-mariner,—and so had fared Through twenty seasons; but he had been rear'd Among the mountains, and he in his heart Was half a Shepherd on the stormy seas. Oft in the piping shrouds had Leonard heard The tones of waterfalls, and inland sounds Of caves and trees: […]"
• (intransitive) Of a queen bee: to make a high-pitched sound during certain stages of development.

noun

• (finance) Acronym of private investment in public equity.