n.1 a person who reveals (esp. discreditable) information about another's private affairs or behaviour.
2 (attrib.) that reveals or betrays (a tell-tale smile).
3 a device for automatic monitoring or registering of a process etc.
n.1 a person who reveals (esp. discreditable) information about another's private affairs or behaviour.
2 (attrib.) that reveals or betrays (a tell-tale smile).
3 a device for automatic monitoring or registering of a process etc.
Oxford English vocab. Оксфордский английский словарь. 2012