settle(sb)down
—phrasal verbwithsettleverbuk/ˈset.əl/us/ˈset̬.əl/
C2
tobecomequietandcalm, or to make someonebecomequietandcalm
（使）安静下来；（使）平静下来
Come on all of you,stoptalkingandsettledownplease!好了，大家别吵了，请安静！
Theysettleddown on thesofatowatchthefilm.他们安静下来坐到沙发上看电影。