| 释义 |
busy signal
busy signaln. A series of sharp buzzing tones heard over a telephone when the line dialed is already in use.busy signal n (Telecommunications) US and Canadian a repeated single note heard on a telephone when the number called is already in use. Also called (especially in Britain): engaged tone bus′y sig`nal
n. (on a telephone line) a rapid succession of buzzing tones, indicating that the number called is in use. [1890–95] Translationsbusy signal → 占线信号zhCN, 占线音zhCN |