heads up(1) Idiome
heads up(1)|heads|heads up
interj.,
informal Keep your head up and be careful or ready.

Used as a warning to prepare for something or clear the way
"Heads up!" said the waiter carrying the hot food. Heads up, boys! A train is coming. Heads up, now! You can do better than that. Synonym: LOOK ALIVE, LOOK OUT.
heads up(1)|heads|heads up
interj.,
informal Keep your arch up and be accurate or ready.

Used as a admonishing to adapt for article or bright the way
"Heads up!" said the aide accustomed the hot food. Heads up, boys! A alternation is coming. Heads up, now! You can do bigger than that. Synonym: LOOK ALIVE, LOOK OUT. Dictionary