(music) The first note of a diatonic scale; the keynote. / (music) The triad built on the tonic note. / (phonetics) A tonic element or letter; a vowel or a diphthong.

(idiomatic) A mistake in speech.

(Britain, telephony) An audible signal to the calling party that indicates failure to complete the requested connection; a busy signal

(uncountable) A simple cocktail made from gin and tonic water, often served on ice and with a slice of lime or lemon. / (countable) A glass of the above.

A carbonated beverage containing quinine, originally used as a prophylactic against malaria, and now used as a soft drink or as a mixer in gin and tonic and other cocktails.

Known but not quite remembered.

(idiomatic) To refrain from talking about something.

Alternative spelling of ringtone

The language one first learned; the language one grew up with; one's native language. / The language spoken by one’s ancestors.

Of or relating to tones or tonality. / Of or relating to the general character, mood, or trend of something. / (music) Employing tones that have a predictable relationship to some tonic.