Shadowing
WordNet

adjective


(1)   Following surreptitiously; keeping under surveillance
"Always on guard against shadowing submarines"

noun


(2)   The act of following someone secretly
WiktionaryText

Noun



  1. The effect of being shadowed (in the sense of blocked), as from a light source or radio transmission.
  2. Speech shadowing is when an individual repeats speech as they hear it immediately without delay (usually through earphones).
 
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