to not  lose  (any) sleep  over  somebody or something
<i>not</i>
nɒt
not
lose
lu:z
looz
(any)
ɛni
eni
sleep
sli:p
slip
<abbr style="text-decoration: underline;" title="over / about" > over</abbr>
əʊvə
ewvē
somebody or something
sʌmbədi
sambēdi

英語での「not lose (any) sleep over somebody or something 」の定義と意味

to not lose (any) sleep over somebody or something
01

to not be upset or concerned about someone or something at all 

to {not} [lose] (any|) sleep (over|about) {sb/sth} definition and meaning
慣用句
くだけた
I would not lose any sleep over his comments. 
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