1) Appease 2) Assuage 3) Calm 4) Conciliate 5) Gruntle 6) Lenify 7) Mollify 8) Pacify 9) Placate 10) Quiesce 11) Reassure 12) Shush 13) Silence 14) Tranquilize 15) Tranquillise 16) Tranquillize 1) Become quiet or quieter 2) Cause to be quiet or not talk 3) Change intensity 4) Hush 5) Make calm or still 6) Mute 7) Pipe down 8) Quiesce 9) Quiet 10) Quiet down 11) Silence 12) Soften 13) Stifle 14) To become quiet 15) To make quiet 
[v] - become quiet or quieter
silence verb cause to be quiet or not talk; `Please silence the children in the church!`