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не выполнять обязательства stresses
gen.	default; be in default (ssn)
econ.	fail to meet one's commitments; fail to one's liabilities
Makarov.	default obligations; default on obligations
не выполнять обязательств
gen.	default; play fast and loose
econ.	fail to perform obligations; fail to meet liabilities (obligations); fail in one's obligations
не выполнять обязательство
busin.	default on; default on an obligation

не выполнять обязательства: 18 phrases in 7 subjects

Banking	1
Business	4
Economy	4
Finances	1
General	4
Makarov	3
Maritime law & Law of the Sea	1