"quietens" in the verb sense
1. quieten, hush, quiet, quiesce, quiet down, pipe down
become quiet or quieter
"The audience fell silent when the speaker entered"
2. calm, calm down, quiet, tranquilize, tranquillize, tranquillise, quieten, lull, still
make calm or still
"quiet the dragons of worry and fear"
3. hush, quieten, silence, still, shut up, hush up
cause to be quiet or not talk
"Please silence the children in the church!"
Source: WordNet® (An amazing lexical database of English)
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