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1.
1) To increase something by the smallest possible increment/margin.
2) To make a small adjustment
"Damn, this sweet potato pie will never be ready for 7pm, i better mincrease the oven temperature"
by Drunk Male April 18, 2009
 
2.
To minimally increase, as in to increase in very small amounts.
The theorist's use of flowery language increased the size of his document, but only mincreased the quality of his overall message.
by Silventar Photography August 18, 2009