clincher
decisive factor

But senior Administration officials say the full moon may not be a decisive factor in their decision on when to move.

The current system certainly has its share of such problems as well, so this should not be a decisive factor.

His choice of the part must have been the decisive factor.

In the long run that turns out to be the decisive factor.

Time spent at home, however, is not necessarily the decisive factor.

All else is nice but not the decisive factor anymore.

Another decisive factor is the work that takes place before the start of camp.

I think that this will be a very decisive factor indeed in future.

Industry still remains a decisive economic factor for Europe, although it is no longer the only one.

The decisive factors will probably ultimately be the global economy and the price of oil.