A small spoon used to stir the contents of a cup or glass. / A unit of measure, equivalent to one-third of a tablespoon or roughly five milliliters.

To serve with a teaspoon

A person who teaches, especially one employed in a school. / The index finger; the forefinger. / An indication; a lesson.

Something taught by a religious or philosophical authority. / The profession of educating people; the activity that a teacher does when he/she teaches.

present participle of teach

(anatomy) The projection of a mammary gland from which, on female mammals, milk is secreted. / Something resembling a teat, such as a small protuberance or nozzle.

(idiomatic, US) Tumbling upside down. / (idiomatic, US) Frantically.

(US, idiomatic) In complete disarray.

(dated outside US) A vessel used to boil water for tea or other hot beverages.

(intransitive, rare) To make a shrill sound like a boiling teakettle.