Also means
to disturb
Usage Note
Alterar means to change or modify something, often with a negative connotation of disruption (alterar el orden público — to disturb public order). The reflexive alterarse means to become agitated or upset. Distinguish it from cambiar, which is neutral, and modificar, which is more technical.
Examples
"No quiero alterar tus planes."
Natural Translation
I don't want to alter your plans.

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