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The French word

l'appui

means
support (m)
Examples:
On a besoin de l'appui de Tom.
We need Tom's support.
Sans votre appui infaillible, ma mission aurait échoué.
But for your steady support, my mission would have resulted in failure.
Son appui financier est indispensable pour ce projet que nous avons.
Her financial support is indispensable to this project of ours.
Tout ce que vous pourriez faire à l'appui de leur effort serait très apprécié.
Anything you could do in support of their effort would be very much appreciated.
Examples sourced from tatoeba.org