Also, press one's luck. Risk one's good fortune, often by acting overconfidently, as in We've gotten all but one of the concessions we asked for; demanding that last one would be pushing our luck, or You've done very well so far, but don't press your luck. [Early 1900s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.