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to settle down (to some business)
自活する
to establish oneself in life―advance in life―succeed in life―get on in life―rise in the world―come to the front
to go to some one for assistance―become a dependent on one
(英語研究になら)to devote oneself to the study of English―(教育事業になら)―commit oneself to the cause of education
自殺する.
to take an active interest in something