Tools on the Calendar
We had plans for today. I had errands to run this morning, the oldest had a friend coming home with him after school, and the entire family had plans to go out this evening. But an unexpected virus has thwarted all that.
throw a monkey wrench into
idiom
Sabotage or frustrate a project or plans. This transfer of industrial sabotage—that is, throwing a tool inside machinery—to other subjects dates from the early 1900s.
"throw a monkey wrench into." The American Heritage® Dictionary of Idioms. Houghton Mifflin Company, 1992. Answers.com 19 May. 2006. http://www.answers.com/topic/throw-a-monkey-wrench-into