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

(pathology) Having tongue-tie or ankyloglossia (“a congenital oral anomaly in which the lingual frenulum (a membrane connecting the underside of the tongue to the floor of the mouth) is unusually short and thick, decreasing mobility of the tongue and affecting eating, speech, etc.”).

simple past tense and past participle of tongue-tie

Alternative form of tongue-in-cheek

(idiomatic) Not intended seriously; jocular or humorous.

(obsolete) With contempt. / With irony.

Any language not native to particular person or place.

A joint, in flooring or panelling, made by fitting a ridge (tongue) along the edge of one board into a corresponding slot (groove) on another.

(idiomatic) Articulate, charming, eloquent.

A verbal rebuke, often severe.