The present participle of 'cue': the act of giving someone a signal, hint, or prompt about what to do or say.
From 'cue' plus the -ing suffix. The practice of cueing became especially important in theater and music performance contexts.
In billiards, 'cueing' refers to the technique of how you stroke the white ball—professional players spend years perfecting their cueing motion because even tiny differences in angle and follow-through completely change where the ball goes.
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