If regular tuning of the piano is neglected,  the piano strings will drop in tension, causing a drop in the piano’s pitch.  A pitch raise is a coarse tuning to raise the tension either completely to A 440, or part way, depending on the particular circumstances. 

The greater the change in tension/pitch is made, the less stable the tuning may be.  So, the piano may need to be re-tuned sooner than usual.

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