- 紧密相联 jǐnmìxiānglián closely interrelatedclosely interrelated; intimately related
- 紧密织物 jǐnmìzhīwù closely woven fabricfabric that has been woven with a high density of threads
- 紧密配合 jǐnmìpèihé to coordinate closelyto coordinate closely; to act in close partnership with others in a partnership