let yourself go
US /lɛt jərˈsɛlf ɡoʊ/
UK /lɛt jərˈsɛlf ɡoʊ/

1.
se descuidar, se abandonar
to become less careful about your appearance or health
:
•
After he retired, he really let himself go and gained a lot of weight.
Depois que ele se aposentou, ele realmente se descuidou e ganhou muito peso.
•
She used to be so stylish, but lately, she's really let herself go.
Ela costumava ser tão estilosa, mas ultimamente, ela realmente se descuidou.
2.
se soltar, relaxar
to allow yourself to relax completely and enjoy something
:
•
The music was so good, I just had to let myself go and dance.
A música era tão boa, eu só tive que me soltar e dançar.
•
It's important to sometimes let yourself go and enjoy the moment.
É importante às vezes se soltar e aproveitar o momento.