throw a wrench into the works

:  to propel through the air by a forward motion of the hand and arm

:  to propel through the air in any manner

:  pitch

:  an act of throwing, hurling, or flinging

:  an act of throwing dice

:  the number thrown with a cast of dice

:  to move with a violent twist

:  to undergo twisting

:  to pull or strain at something with violent twisting

:  a violent twisting or a pull with or as if with twisting

:  a sharp twist or sudden jerk straining muscles or ligaments

:  the resultant injury (as of a joint)

:  activity in which one exerts strength or faculties to do or perform something:

:  sustained physical or mental effort to overcome obstacles and achieve an objective or result

:  activity that a person engages in regularly to earn a livelihood

:  used for work

:  suitable or styled for wear while working

:  involving or engaged in work

:  to bring to pass :  effect

:  to fashion or create a useful or desired product by expending labor or exertion on :  forge, shape

:  to make or decorate with needlework