Answer: TSTS

AnswerCrossword Clue
TSTS"Silence!" calls
TSTSHissing sounds enjoining silence.
TSTSSounds enjoining silence.
TSTSHissed sounds meaning "hush!"
TSTSHissed sounds of caution.
TSTSHissing sounds.
TSTSHissed sounds.
TSTSExclamations enjoining silence.
TSTSSounds seeking silence.
TSTSCalls for silence.
TSTSSibilant signals.
TSTSSibilant sounds.
TSTSHisses for silence
TSTSCalls for silence
TSTSHissed reproofs