1. (verb)calm, calm down, cool off, chill out, simmer down, settle down, cool it become quiet or calm, especially after a state of agitation "After the fight both men need to cool off."; "It took a while after the baby was born for things to settle down again."
2. (verb)calm, calm down, quiet, tranquilize, tranquillize, tranquillise, quieten, lull, still makecalm or still "quiet the dragons of worry and fear"
3. (verb)lull, calm down become quiet or less intensive "the fighting lulled for a moment"
Definitions of calm down 
Afrikaans: kalmeer
Arabic: يُهدّئ، يُسكّن، يُطمئن
Bulgarian: успокоявам
Brazilian: acalmar
Czech: uklidnit
German: sich beruhigen
Danish: tag det roligt
Greek: ησυχάζω κπ.
Spanish: tranquilizarse, calmarse
Estonian: rahustama, rahunema
Farsi: آرام کردن
Finnish: rauhoittua
French: (se) calmer
Hebrew: לְהֵירָגַע
Hindi: शांत होना
Croatian: smiriti se
Hungarian: megnyugtat
Indonesian: menenangkan
Icelandic: róa, stilla
Italian: calmare, calmarsi
Japanese: 落ち着かせる
Korean: 가라앉히다
Lithuanian: nu(si)raminti
Latvian: nomierināties; nomierināt
Malay: menenangkan
Dutch: (doen) bedaren
Norwegian: roe ned; ta det rolig
Polish: uspokajać się
Persian: آرام کردن
Pashto: آرامول
Portuguese: acalmar
Romanian: a (se) linişti
Russian: успокаивать(ся)
Slovak: upokojiť (sa)
Slovenian: umiriti (se)
Serbian: umiriti
Swedish: lugna ner sig (ngn)
Thai: ทำให้สงบ
Turkish: sakinleş(tir)mek, yatış(t
Taiwanese: 鎮靜下來
Ukrainian: заспокоювати(ся)
Urdu: تسکین دینا ، پُر سکون ہون
Vietnamese: trấn tĩnh
Chinese: 镇静下来
