In English
“the rooster's own mouth kills the rooster”
Meaning
'Cock mout kill cock' — the rooster's own mouth kills the rooster. Talking too much — boasting, running your mouth, or giving yourself away — brings about your own downfall, the proverb warns. Just as the crowing cock reveals its whereabouts to the one who would catch it, careless or boastful speech betrays a person and lands them in trouble. It is a shrewd caution to guard your tongue, since more people are undone by what they say than by anything done to them.
Examples
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Him brag bout di robbery an police hear; cock mout kill cock.
He bragged about the robbery and the police heard; loose talk brings your downfall.
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Learn fi hush — cock mout kill cock.
Learn to keep quiet — your own mouth can be your ruin.
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She talk sheself inna trouble; cock mout kill cock.
She talked herself into trouble; careless speech betrays you.
Origin
A barnyard image: the rooster's crowing announces where it is and marks it out — its own mouth is its undoing. 'Cock' here is the rooster. A figure for how careless talk brings a person down.
How it’s used
A caution against boasting or talking too much. 'Cock' is used in its plain sense of a male fowl.