[; , ]a slight or gradual fall in the amount, value, etc. of sth（微弱或逐渐的）下降，降低，贬值◆A slippage in prices would be bad for the economy.价格下降对经济不利。failure to achieve an aim or complete a task by a particular date or to a particular standard延误；逾期◆The smallest slippage could delay completion of the project.稍有延误都有可能使工程无法按时完工。 () the difference between an amount that you have estimated and the actual amount（预期额与实际额的）差额