noun

• (botany) A foliage leaf or any of the many and often considerably different structures it can specialise into.
• (publishing, bookbinding, advertising) A sheet of a book, magazine, etc. (consisting of two pages, one on each face of the leaf).
  "Heretofore advertisers have had to buy and pay for a leaf — two pages."
• (in the plural) Tea leaves.
• (plural leaves or leafs) A moveable panel, e.g. of a bridge or door, originally one that hinged but now also applied to other forms of movement.
  "The train car has one single-leaf and two double-leaf doors per side."

verb

• (intransitive) To produce leaves; put forth foliage.
  "Then flowered the mead, then leafed all 'Twas caused by the runic lay."
• (transitive) To divide (a vegetable) into separate leaves.
  "The lettuce in our burgers is 100% hand-leafed."
• (informal, transitive, uncommon) To play a prank on someone by throwing a large clump or collection of leaves at them.

noun

• (Internet slang, humorous, sometimes pejorative) A Canadian person.
• (slang, Canada) A member of the Toronto Maple Leafs hockey team, its organization, or its supporters.