n. A low, steady tone in a telephone receiver indicating that a number may be dialed.
di′al tone`
n. a steady telephone tone indicating that the line is ready for dialing. [1890–95]Translations拨号音
dial tone
→ 拨号音zhCN
dial tone
enUS
dial tone
[′dīl ‚tōn] (communications) A tone employed in a dial telephone system to indicate that the equipment is ready for dialing operation.AcronymsSeedesktop