This is the 3378th most frequent Spanish word.
dejarse
"Dejarse" means "to allow oneself" or "to let oneself."
In this sentence, 'dejarse' is used reflexively to indicate accidentally leaving something behind.
Me dejé los guantes en casa.
I left my gloves at home.
Here, 'dejarse' is used reflexively in a motivational context meaning not to permit oneself to be affected negatively.
No te dejes vencer por el miedo.
Don't let yourself be overcome by fear.
This phrase uses 'dejarse' reflexively to convey neglect of personal care or standards.