On a serious note let's not forget that a major cause of the world's worst air disaster at Tenerife was ambiguous r/t calls.
At that time you called "Gxxx ready for take off" and the clearance was "Gxxx clear to take off".
An a/c at the hold called "ready for take off", followed immediately by the next a/c in line also calling "ready for take off". First a/c thought he'd heard "clear to take off" in response to his call and went thundering down the runway into a backtracking a/c that had just landed and was hidden by fog.
That's why we now call "Gxxx ready for departure".
This is all from memory so apologies in advance if anything is not quite 100%
Mike