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.
Shake, quiver, tremble, vibrate refer to an agitated movement that, in living things, is often involuntary. To shake is to agitate more or less quickly, abruptly, and often unevenly so as to disturb the poise, stability, or equilibrium of a person or thing: a pole shaking under his weight. To quiver is to exhibit a slight vibratory motion such as that resulting from disturbed or irregular (surface) tension: The surface of the pool quivered in the breeze.