tighten up
US /ˈtaɪ.tən ʌp/
UK /ˈtaɪ.tən ʌp/

1.
apertar, reforçar
to make something tighter or more secure
:
•
Please tighten up the screws on this chair.
Por favor, aperte os parafusos desta cadeira.
•
The regulations need to be tightened up to prevent fraud.
Os regulamentos precisam ser apertados para prevenir fraudes.
2.
apertar, melhorar
to become more disciplined or efficient
:
•
The team needs to tighten up their defense.
A equipe precisa apertar sua defesa.
•
We need to tighten up our spending habits.
Precisamos apertar nossos hábitos de gastos.