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чесать языком stresses
gen.	make chin music (andreevna); gab away (I'm on a crosswalk and this lady in a white SUV is gabbing away with a friend and not looking. ART Vancouver); flap (Bullfinch); natter
Gruzovik	chatter
Игорь Миг	talk a blue streak; shoot the shit
austral.	yabber (Taras)
brit.	chin wag (andreevna)
Gruzovik, inf.	talk idly
inf.	babble; prattle; bloviate (Andrey Truhachev); chinwag; run down lines with (VLZ_58); flap gums (They're still out on the porch, flapping their gums. VLZ_58); jabber (george serebryakov)
Makarov.	gab away; talk by the hour
nonstand.	shoot the bull (igisheva)
Scotl.	clatter
slang	wag one's tongue
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	⇒ сплетничать; трындеть
idiom., inf.	yawp; chin; yatter; flap one's chops; flap one's jaw; flap one's jowls; flap one's mouth; flap about; flap chops (В.И.Макаров); flap jaw (В.И.Макаров); flap jowls (В.И.Макаров); flap mouth (В.И.Макаров); shoot the breeze (We were just standing around shooting the breeze. Alexander Demidov)
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gen.	jabber; tattle
Gruzovik	chatter
inf.	babble; prattle
Makarov., amer.	chew the rag
Makarov., disappr.	wag one's tongue (болтать)
mil., inf.	work the bolt
slang	chew the fat; flap one's jaw (yashenka)

чесать языком: 15 phrases in 5 subjects

American usage, not spelling	1
General	3
Idiomatic	4
Informal	2
Makarov	5