Definition of "big top" []

• The main tent of a circus. (noun)
• The circus. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Under the mist a crew of men were unrolling the big top of the Clyde Beatty Circus."
• "The big top sergeant stepped in, the door shut, the scar­let transitter light glowed for the second time, the door opened as more air gushed into the waiting vacuum."