Crossword puzzle clue "it's often tested with hello"

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

Answer
Clue
Relevancy
echo
Clue
"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 by shouting "Hello!"
It's often tested with "Hello!"
Definition
a reflected sound

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