How to Say "dive in" in Spanish
The Spanish word for “dive in” is “lanzar” — B1 level. This is a very common word in everyday Spanish.
English → SpanishB1
verbB1neutral/informal
to start something suddenly or enthusiastically

Examples
Decidió lanzarse al agua sin dudar.
She decided to jump into the water without hesitation.
Llevaba meses pensando en el negocio, y finalmente se lanzó.
He had been thinking about the business for months, and finally he took the plunge.
The 'Se' makes it Reflexive
When you see 'lanzarse' (with the 'se'), it means the action is directed back at the person doing it, usually implying they are propelling themselves or committing themselves fully to an action.
Forgetting the 'Se'
Mistake: “Using 'Él lanzó' when meaning 'He took the plunge'.”
Correction: Use 'Él se lanzó' to mean he committed himself. 'Él lanzó' only means 'He threw (an object).'
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