Here, the crowing of the rooster refers to a certain time of day. Roosters often crow just before the sun appears in the morning. Therefore, this refers to dawn. (See: [[rc://en/ta/man/translate/figs-metonymy]])
a bird that calls out loudly around the time the sun comes up
# this day
The Jewish day begins at sunset. Jesus was speaking after the sun had set. The rooster would crow just before morning. The morning was part of "this day." AT: "tonight" or "in the morning" (See: [[rc://en/ta/man/translate/figs-explicit]])