To flog a dead horse means to waste effort on something when there is no chance of succeeding.
A bull in a china shop means one who is aggressive and clumsy in a situation that requires delicacy and care.
The alpha and the omega means the beginning and the end; the entirety of something. (Alpha and omega are the first and last letters of the Greek alphabet).
A fool?s errand means a task that has little to no chance of being successful or beneficial.
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