Imagine something is smoldering. If someone blows (supplies additional oxygen) at this object the right way, the fire will increase. Note that if you blow too strongly, the fire may extinguish.
The same effect happens in forest fires when the wind sometimes makes a small fire large.
What is the expression for increasing the intensity of a fire by blowing at it?
Usage in a sentence:
Autumn winds [...] the fire of their love.
This means that in summer the involved parties were slightly attracted to each other (low intensity of fire), then the autumn came, and thereafter they've fallen in love with each other completely (high intensity of fire).
Candidates I found:
- to blow the fire
- to fan the fire
Russian equivalent: раздувать огонь