v. phr. 1. To accept as a duty or responsibility. He took it on himself to see that the packages were delivered. 2. To assume wrongfully or without permission as a right or privilege. You should not have taken it upon yourself to accept the invitation for the whole family.
TAKE ON ONESELF
Meaning of TAKE ON ONESELF in English
American idioms English vocabulary. Английский словарь американских идиом. 2012