Underboost

Part of speech: noun, verb

Definitions

1. A condition where a turbocharged or supercharged engine produces less boost pressure than intended
2. The state of an engine receiving below-normal air pressure from its forced induction system
3. An occurrence in which a vehicle's performance suffers due to reduced boost in the forced induction mechanism

Etymology: "Underboost" is a plain compound: the prefix "under-", meaning insufficient or below the intended amount, attached to "boost," the word for the pressure a turbocharger or supercharger adds to the air entering an engine. Together they name the shortfall itself, an engine delivering less pressure than its design calls for. The base word has its own engine-related history. "Boost" in this sense is a motoring term that came into use with the spread of forced induction, and it carries the general sense of pushing something upward or increasing it. Pairing it with "under-" follows a pattern English uses for many technical shortfalls, such as underinflate or undervolt, where the prefix names a quantity below the target. Because the word is a recent technical coinage built from transparent parts, its meaning is clear from its components, and it appears mainly in automotive tuning and diagnostic contexts where a gauge or boost reading falls short of specification.

Synonyms: reduce boost, limit power, depress, diminish force

Antonyms: boost, increase power, amplify, strengthen