spare (someone) the details

:  to forbear to destroy, punish, or harm

:  to refrain from attacking or reprimanding with necessary or salutary severity

:  to relieve of the necessity of doing or undergoing something

:  not being used

:  held for emergency use

:  being over and above what is needed :  superfluous

:  a spare tire

:  a duplicate (such as a key or a machine part) kept in reserve

:  the knocking down of all 10 pins with the first 2 balls in a frame in bowling

:  some person :  somebody

:  extended treatment of or attention to particular items

:  a part of a whole: such as

:  a small and subordinate part :  particular

:  to report minutely and distinctly :  to report with close attention to small elements :  specify

:  to assign to a particular task

:  to furnish with the smaller elements of design and finish