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gen.	shoot mouth off (It's just like Richard to go shooting his mouth off about other people's business. cambridge.org Taras); gab; jaw-jaw; shoot off mouth; wag one's tongue (Alexander Demidov); jabber (Anglophile); jaw jaw; shoot off one's face; blab; shoot at the mouth; shoot mouth (Taras); shoot mouth about (Taras); prate (Taras)
Игорь Миг	shoot the shit
amer., rude	throw the bull
Gruzovik, inf.	blather; talk idly
idiom.	shout the odds (Yeldar Azanbayev); have a big mouth (Yeldar Azanbayev); shoot mouth off (VLZ_58); waste one's breath (Сomandor)
inf.	chew the fat (Anglophile); blether (Anglophile); twaddle (Anglophile); run mouth off (Damirules); blab something around (dkozyr); prattle (Anglophile); yak (Tell him to stop yakking about it. ART Vancouver); spout off (VLZ_58); blab (VLZ_58); babble; chatter
Makarov.	blab (разглашать секреты); blabber (разглашать секреты); blather (болтать попусту); prattle (болтать попусту); twaddle (болтать попусту); chew the fat (болтать попусту); chew the rag (болтать попусту)
nonstand.	shoot the bull (igisheva)
slang	beat gums; beat chops; run down some lines (VLZ_58)
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inf.	chew the rag (Anglophile)

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Idiomatic

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