scribble down
To write something hastily by hand. He quickly scribbled down a phone number on a slip of paper and pushed it across the desk to me. The students were all scribbling down their notes so intensely that they didn't even notice their teacher leave the room.
scribble something down
to write something down fast and not too neatly. He scribbled the figure down and raced for the telephone. Liz scribbled down the telephone number.
scribble down
v. To write something quickly without paying attention to readability or style: She grabbed a piece of paper and scribbled down the address that I told her. He scribbled a number down on his notepad.