Amazon PPC glossary
Budget starvation
A condition that occurs when a single keyword within an ad group consumes the entire daily budget before the other keywords have a chance to gather meaningful data.
Where it matters most: Book 1, The Amazon PPC Clarity Guide, in the chapter “Campaign Architecture.”
Go deeper
The glossary gives you the one-line answer. The Amazon PPC Clarity Guide explains why it matters and what to do about it.