to be related to; to involve or have to do with; often used in the idiom 性命交关 xìng​mìng​jiāo​guān meaning "to be a matter of life and death"

(literary) to have dealings with; to socialize with

(literary) to collude or collaborate with someone for illegal or dishonest purposes

(Wu dialect) very; much; a great deal

(literary) to conduct business; to carry out a commercial transaction

(literary) to be mixed or interwoven; to cross each other