To speak in a language unknown to the speaker, especially when in a state of religious ecstasy; glossolalia.

A megaphone (of the older, non-electric kind).

Used other than figuratively or idiomatically: see speak, for. To provide an opinion only on one's own behalf. / (idiomatic, imperative) Expressing disagreement with an opinion expressed by another.

(idiomatic, humorous) An expression sometimes used when a person mentioned in the current conversation happens to arrive on the scene.

(idiomatic) To talk more loudly or plainly. / (idiomatic) To make oneself or one's opinions known; to advocate or assert oneself.

(idiomatic) To assert or promote one's opinion; to make one's thoughts known.

an intercom that allows a visitor to a building to speak to someone inside before being allowed entry; an entryphone

In a manner of speaking.

phatic conversation about the weather. / meteorological jargon

Being totally accurate (used as a phrase to specify).