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assure [assured, assuring, assures]▼(to give someone confidence in the trustworthiness of something)
verb
[UK: ə.ˈʃɔː(r)] [US: ə.ˈʃʊr]

reassure [reassured, reassuring, reassures]▼(to assure anew; to restore confidence to; to free from fear or self-doubt)
verb
[UK: ˌriːə.ˈʃʊə(r)] [US: ˌriə.ˈʃʊr]