1.
busy (phone line); engaged
The state of a phone line being occupied, producing a busy signal when called.
2.
in the middle of talking; currently speaking
Being in the process of a conversation, not yet finished talking.
Composed of 話し (talking) and 中 (in the middle of, during). The phone-related sense (sense 1) was the primary meaning, but with the decline of landlines, sense 2 (currently talking) is increasingly common.
Common collocations
- 話し中の音: busy signal (phone)
- 話し中でつながらない: can't get through because the line is busy
- 話し中に割り込む: to cut in while someone is talking
Similar patterns
The ~中 suffix attaches to many nouns to mean 'in the middle of':