How to Say "to insert" in Spanish
The Spanish word for “to insert” is “meter” — A1 level. This is a very common word in everyday Spanish.

Examples
Mete la llave en la cerradura antes de girarla.
Put the key in the lock before turning it.
Siempre meto mis libros en la mochila cuando termino la clase.
I always put my books in my backpack when I finish class.
El técnico tuvo que meter un cable nuevo por la pared.
The technician had to run a new cable through the wall.
Direct Object Needed
When using 'meter' in this physical sense, you must say what you are putting inside (the direct object): 'Meto el dinero' (I put the money).
Confusing 'Poner' and 'Meter'
Mistake: “Pongo la ropa en el armario (when you mean inside the closed space).”
Correction: Meto la ropa en el armario. ('Meter' is better when the action involves fully containing something, like putting clothes inside a closet or a book inside a bag. 'Poner' is more general 'to place on top of' or 'to set down').
Related Translations
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