Definition
Having a sufficiently close or familiar relationship with someone to address them by their given name.
相熟到可以直呼其名
After several meetings, we were on first-name terms.
经过几次会议后，我们已经可以直接称呼彼此的名字。
They were soon on first-name terms.
他们很快就直接称呼彼此的名字。
In the small company, everyone is on first-name terms.
在这家小公司里，每个人都直接称呼彼此的名字。