throw a monkey wrench into
Sabotage or frustrate a project or plans, as in The boss threw a monkey wrench into our plans when he said we'd have to work Saturday. This transfer of industrial sabotage—that is, throwing a tool inside machinery—to other subjects dates from the early 1900s.
Words nearby throw a monkey wrench into
throughway,
throve,
throw,
throw a curve,
throw a fit,
throw a monkey wrench into,
throw a party,
throw a punch,
throw about,
throw away,
throw back