Standby
Please, as an ATC here, if you are asked to “standby” please don’t read that back to us, just keep quiet haha
we are generally attending to another matter like telephone cooordination or working out separation, which is interrupted every time there’s a transmission, including the response “standing by”. A read back of this sort causes much vexation And higher likelihood that the return of your call goes further down the list of things to do 😂😂