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busy-wait: vi. Used of human behavior, conveys that the subject is
   busy waiting for someone or something, intends to move instantly as
   soon as it shows up, and thus cannot do anything else at the
   moment.  "Can't talk now, I'm busy-waiting till Bill gets off the

Technically, `busy-wait' means to wait on an event by spinning through a tight or timed-delay loop that polls for the event on each pass, as opposed to setting up an interrupt handler and continuing execution on another part of the task. This is a wasteful technique, best avoided on time-sharing systems where a busy-waiting program may hog the processor.