I .
➡ sink into sth
II .
to spend a lot of money on a business or an activity, for example in order to make money from it in the future :
We sank all our savings into the venture.
I .
➡ sink into sth
II .
to spend a lot of money on a business or an activity, for example in order to make money from it in the future :
We sank all our savings into the venture.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005