Drop-ins N. [prob. By Analogy With Drop-outs] Spurious Characters Appearing On A Terminal Or Console As A Result Of Line Noise Or A System Malfunction Of Some Sort.

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drop-ins n.

[prob. by analogy with drop-outs]
Spurious characters appearing on a terminal or console as a result
of line noise or a system malfunction of some sort. Esp. used
when these are interspersed with one's own typed input. Compare
drop-outs, sense 2.

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