stackup

/ˈstækˌʌp/
noun
  1. A situation in which multiple things accumulate or occur at the same time, often causing a delay or problem.
    • There was a stackup of planes waiting to land at the airport.
    • A stackup of orders during the holiday season delayed shipments.
    • The email stackup meant she had over a hundred messages to read.
  2. In engineering or manufacturing, the combined effect of tolerances in a series of parts or layers.
    • A poor stackup in the assembly caused the machine to wobble.
    • The engineer calculated the stackup of tolerances to ensure the parts fit together.
    • They adjusted the design to reduce the stackup error.
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