Synonyms of 'beware'
guard against something
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If a person or vehicle avoids someone or something, they change the direction they are moving in, so that they do not hit them.
He had ample time to swerve and avoid the woman.
If you shun someone or something, you deliberately avoid them or keep away from them.
From that time forward everybody shunned him.
Thesaurus for beware from the Collins English Thesaurus
If you tell someone to beware of a person or thing, you are warning them that the person or thing may harm them or be dangerous .