Definition of "underdelivering" [underdelivering]

• Present participle of underdeliver. (verb)

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• "It's a curious fact that genomics has always been sold as a medical story, yet it keeps underdelivering useful medical knowledge and overdelivering other stuff."
• "Perpetually overpromising and underdelivering is not remotely good enough, not even for government work."
• "In her account, Petraeus also faults McChrystal for overpromising and underdelivering in places like Taliban-riddled Marjah in the south, producing months of embarrassing headlines that hurt the war effort back in Washington."