to watch what is happening and be careful.

But when the ice suddenly breaks, look out.

Usage notes: often used as an instruction:

Someone shouted, “Look out, he's got a gun!”

Related vocabulary: watch out

• the other side of the coin
• the other side of the tracks
• the pants off
• the pants off someone
• the parting of the ways
• the party is over
• the path of least resistance
• the patience of a saint
• the patience of Job
• the patter of tiny feet
• the pearly gates
• the pedal to the metal
• the pen is mightier than the sword.
• the penny drops
• the person in the street
• the pick of
• the pick of something
• the picture of
• the picture of something
• the pink pound
• the plot thickens
• the plot thickens.
• the point of no return
• the pot calling the kettle black
• the power behind the throne