instant-message
verb [ T ] uk/ˌɪn.stənt ˈmes.ɪ.dʒ/ us/ˌɪn.stənt ˈmes.ɪ.dʒ/
即时通信
to communicate with someone over the internet using a service available on the internet that allows you to exchange written messages with someone else who is using the service at the same time