An anonymous telephone call, or one that is made to threaten, annoy, or harass its recipient.
〈印度〉匿名电话；恐吓电话；骚扰电话
Example sentencesExamples
And why haven't you been getting a blank call?
This kind of depravity is also found among people who make blank calls, or whistle at pretty women, or throw garbage on cricket fields, or scribble graffiti on historic monuments.
They made blank calls to our rooms in the wee hours of the morning to check that we were still in our hotel rooms and not out spying.