While a machete could theoretically be used for self-defense, similar to a sword, it's generally not recommended or practical for several reasons:

1. Legal implications: The use of a weapon like a machete in self-defense could potentially lead to criminal charges, especially if the force used is seen as disproportionate to the threat. In many places, it's illegal to carry a machete or other large bladed weapon without a specific, valid reason, and self-defense might not be considered a valid reason under the law.
2. Practicality: Machetes, like swords, are large and not easily concealed or carried, making them impractical for everyday self-defense.
3. Training: Using a machete effectively and safely requires significant training. Without it, you're more likely to hurt yourself or innocent bystanders than to defend yourself effectively.
4. Risk of escalation: Introducing a weapon into a conflict can escalate the danger for everyone involved. If the attacker is able to take the weapon from you, it could be used against you.
5. Perception: Carrying a machete, even if you're doing so legally and for the purpose of self-defense, could lead to you being perceived as a threat. This could result in unnecessary confrontations or encounters with law enforcement.

It's generally better to consider other, more widely accepted and practical means of self-defense, such as self-defense classes, pepper spray, or a personal alarm. Always check local laws regarding self-defense tools and weapons. Laws about self-defense can vary greatly by jurisdiction, so it's important to understand what is legal and acceptable in your specific location.