Spilled array formulas cannot spill into merged cells. Please un-merge the cells in question, or move the formula to another range that doesn't intersect with merged cells. Select the formula to reveal a dashed border that indicates the intended spill range.

The meaning of SPILL is to cause or allow especially accidentally or unintentionally to fall, flow, or run out so as to be lost or wasted. How to use spill in a sentence.