verb. become unstable.
verb. make unstable.
1. Verb, base form Any seeping water will destabilise the well. 2. Verb, non-3rd person singular present Paint strippers destabilise the paint, making scraping the layers off easier. 3. Noun, singular or mass Buildings can function without it on a day-to-day basis, but should an earthquake destabilise a building it is the cross-bracing that will keep it standing.