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ручаться v stresses
gen.	warrant; vouch for (with за + acc.); avouch; certify; ensure; gage; impawn; mortgage (словом); pawn; sponsor; undertake; vouch; pass one's word for; answer for (за кого-либо); pledge word; eat head off; be stand sponsor for (someone); за кого-либо); represent (Lavrov); swear; bail someone out; pass word (за кого-либо-for); stand surety for (за кого-либо); engage for (за кого-либо); underwrite; pledge; answer; pledge one's honour; pledge one's word; pledge honour; swear by (newbee); bail (за что-либо; разг.); be stand sponsor for (someone); за кого-либо); stand surety (за кого-либо); make good; plight; undertake for; guarantee
Gruzovik	guarantee
adv.	give security
arch.	undertake (за кого-либо)
busin.	grant surety; guaranty
econ.	become security; stand security; become security (выступать поручителем); sponsor (выступать поручителем); stand security (выступать поручителем)
inf.	go bail
invest.	become the security
law	go bail for; mortgage (словом и т.п.); be a guarantee of (за; something Andrey Truhachev); avouchment (Право международной торговли On-Line); guarantee (за; something Andrey Truhachev)
law, inf.	bail (за что-либо)
Makarov.	answer for (someone); за кого-либо); eat one's head off; go bail for (за что-либо); answer to; engage for (за кого-либо); mortgage; pass one's word; pledge oneself
obs.	impledge
ручаюсь v
Игорь Миг	I'll bet you anything; I would bet you anything; I'll bet; I bet you anything
Makarov.	I'll eat my head off; I'll give my head for it

ручаться: 107 phrases in 11 subjects

Alternative dispute resolution	2
Audit	1
Business	1
Computing slang	1
General	58
Idiomatic	2
Informal	2
Law	3
Literature	1
Makarov	35
Patents	1