open one's big mouth

Verb

 * 1)  To speak about things rashly or foolishly, when it would be better to stay silent.
 * Grr, why do I always open my big mouth after doing something wrong?

Translations

 * Finnish: avata suuri suunsa
 * French:
 * Icelandic:
 * Russian: язы́к зачесался, распустить язы́к