Plain English Meaning
Look at your instruments faster and more often than normal, so you catch any changes right away.
Full Definition
An instruction or technique to scan the flight instruments more rapidly and frequently than usual, used when conditions demand quicker detection of changes -- such as during turbulence, instrument failure, or unusual attitudes.
Context Anchor
Used in instrument failure training when one instrument indication does not match the others or does not match what the airplane seems to be doing.
Derivation
Expedite' comes from the Latin 'expedire,' meaning to free or hasten. 'Cross-check' refers to the pilot's continuous scan across the flight instruments. Together: speed up your .