Verb
overdeliver (third-person singular simple present overdelivers, present participle overdelivering, simple past and past participle overdelivered)
To deliver in excess of a norm, standard, or requirement.
Ancient Peaks produces true terroir wines from their estate Margarita Vineyard in Southern Paso Robles that overdeliver in quality for value. Source: Internet
Conversely, if you over-promise and set customer expectations too high, even if you overdeliver, your customers will still only be just satisfied—not as thrilled as the customers who expected less. Source: Internet