A term in the phonetic classification of consonant sounds on the basis of their manner of articulation: also known as a trilled consonant, or a roll, ‘trill’ refers to any sound made by the rapid tapping of one organ of articulation against another. (Vocal-fold vibration is not included in such a definition.) Several accents of English use the trilled r, as in Welsh and Scots. French and German are examples of languages which have a uvular trill. The trill may also be accompanied by audible friction, and would then be called a ‘fricative trill’. Bilabial trills are also possible, as when one makes a ‘freezing’ noise, brrr [B], or imitates a car engine.