0 past simple and past participle of slacken --
It is obvious that skill differentials have slackened.
The demand for coal has slackened because industry switched to gas at a time when it was half the price of coal.
If our birthrate became steady, or even slackened off, which is by no means impossible, the reverse process might be expected to take place.
Even if the rate of traffic growth has slackened in the last few years, the trend would still appear to me to be encouraging.
As these have slackened, contractions and redundancies have increased.
Yes, the rate of decline in optimism may have slackened slightly, but declining it still is.
It is, therefore, perfectly clear that the drive to improve the trade balance cannot be slackened and, indeed, must be intensified.
So far from the rate of improvement in our education having slackened, it has clearly accelerated.
