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shoot one's mouth off
shoot one's mouth off [idiom]
To speak too much or unwisely about something
زیاد یا بدون فکر حرف زدن در مورد چیزی، حرف پراندن
مثال:
What do you know about working hard? You only have had a part time job for two months and now you are giving me advice on that. Sorry to say that but I think you are shooting your mouth off.