0 If the amount, rate, or quality of something falls off, it becomes smaller or lower. -- （数量）减少；（比率）下降；（质量）降低
1 a reduction in the amount, rate, or quality of something -- 下降；减少
Despite the sudden fall-off in tourism, Wilson is optimistic about the prospects for French Quarter retailers.
Business at those hotels has plummeted more than 50% since the attacks, and he expects a fall-off of 30% for the rest of the year.
Finally, on decreasing once more the wavenumber s, one enter s the range where a distinct exponential fall-off can be seen.
The initial fall-off, the (occasionally rising) plateau and the sharp cut-off are present in each case.
The rapid fall-off of dose reduces the toxicity to normal tissue and is well-tolerated.
Here, v (cm/sec) and 1(cm) are characteristic action potential speed and fall-off distance in the density of corticocortical fibers, respectively.
They imply that my estimates for characteristic fall-off distances in densities of excitatory and inhibitory fibers are arbitrary.
