Crossword puzzle clue "it's often tested by shouting hello"

Here are the possible solutions for it's often tested by shouting hello clue

Answer
Clue
Relevancy
echo
Clue
It's often tested by shouting "Hello!"
"Hello, hello, hello," e.g.
"HELLO! . . . Hello! . . . hello . . ."
HELLO!... Hello!... hello ...
"HELLO!... Hello!... hello ..."
"HELLO Hello hello" effect
"Hello ... hello ... hello ..."
It's often tested with "Hello!"
Definition
a reflected sound

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