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What does feed the notion mean in this context? (Source:Link)
"A French presidential election victory Sunday by centrist Emmanuel Macron, a former investment banker who campaigned as an unabashedly pro-European reformer, over euroskeptic nationalist Marine Le Pen will feed the notion that a populist wave that led to Britain’s Brexit vote last June and Donald Trump’s U.S. presidential victory has crested."
When we feed something (or someone) it grows stronger.
We can feed a baby.
We can feed a plant.
The verb feed thus acquires figurative meaning "to sustain by providing anything that causes something to become stronger".
We can feed a fire.
We can feed a furnace.
The something need not be a physical thing, but can be anything that can be conceived of as capable of becoming stronger or more intense if given what it needs.
We can feed fears.
We can feed suspicion.
We can feed a notion.
For example, you could use as a synonym the expression fuel the idea.
