Wiktionary
ducks on the pond
n. 1 (context Australia English) (non-gloss definition: A coded warning used by men to alert each other that female guests ("ducks") are present ("on the pond"), so that for politeness they should moderate their language.) 2 (context baseball English) Members of a batting order who are on base; baserunners.
Usage examples of "ducks on the pond".
There were even ducks on the pond, teal and goldeneye paused for a rest on their southern flight.