Slippage

['slɪpɪdʒ]

(noun.) failing to hold or slipping out of place; 'the knots allowed no slippage'.

(noun.) a decrease of transmitted power in a mechanical system caused by slipping.

(noun.) decline from a standard level of performance or achievement.

Inputed by Alex--From WordNet

(n.) The act of slipping; also, the amount of slipping.

Editor: Louise