to  play  fast and loose with  somebody or something
play
pleɪ
plei
fast
fɑ:st
faast
and
ənd
ēnd
loose
lu:s
loos
with
wɪð
vidh
somebody or something

英語での「 play fast and loose with somebody or something 」の定義と意味

to play fast and loose with somebody or something
01

to act toward a person or thing without enough care, seriousness, or sense of responsibility 

to [play] fast and loose with {sb/sth} definition and meaning
慣用句
くだけた
You can't play fast and loose with people's trust and then expect them to forgive you. 
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