up [adjective] [after verb; not gradable] - closely connected or involvedThe reasons why the legislation was introduced are complex and bound up with the history of immigration into this country. [after verb]The survival of these creatures is intimately bound up with the health of the ocean. [after verb]Britain's fate is inextricably bound up with Europe's.
BOUND
Meaning of BOUND in English
Cambridge English vocab. Кембриджский английский словарь. 2012