1.   Pursuit encourages further retreat, and so a vicious spiral is established which can destabilize a relationship.

2.   The process goes into a vicious spiral, on a timescale of hundreds of thousands of years.

3.   And yet this vicious regressive spiral must be broken.

4.   Japan is caught in a vicious deflationary spiral, its economy shrinking and its banks threatened by losses so enormous they could shake markets around the world.

5.   So development of new weapons would be frozen, ending the vicious spiral of nuclear move and countermove.

6.   The move marked the start of a vicious downward spiral.

7.   Hatred among hostile ethnic groups tends to be intensified in a vicious spiral.

8.   The last, and by far the least desirable one, allows for a vicious downward spiral where economies continue to dig themselves into ever deeper holes.