The surprise announcement of his candidacy 'caught' his opponents 'flat-footed'. [=his opponents were not prepared for his announcement]
The battery has gone 'flat'. [=('US') the battery is dead; the battery has died]
She finished her homework 'in nothing flat'. [=in no time at all; very quickly]
(..) I'm just saying, she might know something that we don't know. Look, there was a time when everyone thought that the world was flat. It took someone like Dr. Brennan to tell them they were wrong. The world changed. MONTENEGRO: $ from the ATM (..)2015 TvShow: Bones Title: The Promise in the Palace Season: 11 Episode 7
(..) Get Esterhase on the phone. Tell him to call in the Hungarian agents. Yes, sir. Any more news on him? Sir? Oh, God. We need to get down to his flat, clear out anything linked. Haydon heard the news at his club? At ? The ticker-tape wouldn't have been running. So how did he know? (..)2011 Tinker Tailor Soldier Spy
(..) in order to work, Mrs Pope Graham. No disturbances. Her real name is just Graham. Added the Pope for a touch of class. 'Peter, did you get the keys to Control's flat? ' # And did those feet in ancient time # Walk upon England's mountains green # Oh! 'George! ' (..)2011 Tinker Tailor Soldier Spy