Watched the outflow of the tide.
Too much money is outflowing from our household.
There was an outflow of hard currency, leaving the colonists with no medium of exchange.
This arrangement is a method of checking transpiration by creating a still atmosphere above the pore of the stoma, so that water vapour collects in it and diminishes the further outflow of vapour.
The periodic fluctuations in the level of Lake Tanganyika are such that its outflow is intermittent.