The phrase “βοῦς ἐπὶ γλώττῃ” (bous epi glottÄ“) is an ancient Greek proverb. Translated literally, it means “an ox on the tongue.”

Meaning:

This proverb was used to describe a situation where someone is being silent or unable to speak freely, often because they are holding back information or are under some form of constraint. The image of an “ox on the tongue” suggests a heavy weight that prevents speech, symbolizing the burden or pressure that leads to silence.

Usage:

The expression was typically employed when someone knew something but was reluctant or afraid to speak out, either because of fear of consequences or because they were bribed or otherwise coerced into silence.

In modern terms, it might be compared to phrases like “cat got your tongue?” which also imply an unusual or forced silence.