Frustration of purpose has the effect of discharging the promisor from his or her obligation to perform, in spite of the fact that performance by the promisee is possible, since the purpose for which the contract was entered into has been destroyed. For example, an individual reserves a hall for a wedding.
Definition of shake for English Language Learners. : 1  to move sometimes violently back and forth or up and down with short, quick movements. : 2  to move or have parts of your body move in short, quick movements and in a way that you are not able to control.
c.1400, from Latin concussionem (nominative concussio) a shaking, noun of action from past participle stem of concutere shake violently, from com- together (see com-) + quatere to shake (see quash). Modern brain injury sense is from 1540s.