simmering down is simmer down's Present Participle

simmer down

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UK 
  • na.用文火熬浓；冷掉；平定下来
Simple Present：simmers down  Present Participle：simmering down  Past Tense：simmered down  

E-C

E-E

na.
1.
用文火熬浓;冷掉;平定下来