engaged

Compared meaning: busy, not free or available (adjective).

比较义项：忙碌的，没有空的（形容词）。

• busy

  The general, everyday word for having a lot to do; used for people, places, times, or things, such as a busy street or a busy day. Neutral in register.

  最常用、最中性的词，表示事情多、没有空闲时间，可以用来形容人、地点、时间或事物（如热闹的街道、忙碌的一天）。

  She's busy all day, running from one meeting to the next.

  她一整天都很忙，从一个会议赶到下一个会议。

• engaged 本词

  More formal and specific: means occupied with a particular person, task, or appointment right now, so unavailable; also the standard British word for a phone line in use.

  更正式，特指此刻正被某个具体的人或事占用着（如开会、接待客人），因而无法分身；在英式英语中也是“电话占线”的标准说法。

  The line was engaged, so I called back a few minutes later.

  电话占线，所以我过了几分钟才又打回去。

Busy and engaged both mean not free now. Engaged is more formal, meaning someone is occupied with one specific thing, like a meeting or call. Busy is the common, neutral word for this idea. Engaged's more common meaning, 'promised to marry someone', is not compared.

busy 和 engaged 在“正忙、没有空”这个意思上接近，但 engaged 更正式，特指某人当下正被某件具体的事占用（如开会、通话），busy 则是最常用、最中性的说法。这里不比较 engaged 更常见的“订婚”义项。