Etymology
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slippage (n.)

1850, "act of slipping," from slip (v.) + -age.

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Definitions of slippage

slippage (n.)
a decrease of transmitted power in a mechanical system caused by slipping;
slippage (n.)
decline from a standard level of performance or achievement;
slippage (n.)
failing to hold or slipping out of place;
the knots allowed no slippage
From wordnet.princeton.edu