dive in
US /daɪv ɪn/
UK /daɪv ɪn/

1.
lanzarse, sumergirse
to start doing something with enthusiasm and without hesitation
:
•
When the food was served, everyone just dived in.
Cuando se sirvió la comida, todos simplemente se lanzaron.
•
Don't hesitate, just dive in and start learning.
No dudes, simplemente lánzate y empieza a aprender.