DM
noun [ C ] internet & telecoms informal uk/ˌdiːˈem/ us/ˌdiːˈem/
（在社交网站上发送的）私信（direct message 的缩写）
abbreviation for direct message: a private message sent on a social media website, that only the person it is sent to can see
She received threats and abuse in her DMs. 她在私信中受到威胁辱骂。
DM
verb [ I or T ] internet & telecoms informal uk/ˌdiːˈem/ /ˌdiːˈem/
（在社交网站上）发私信，收发直接信息（direct message 的缩写）
abbreviation for direct message: to send someone a private message on a social media website
I'm selling my bike. DM me if you're interested. 我有一辆自行车出售，有兴趣的话可以给我发私信。