if you lie down with dogs, you will get up with fleas
sentenceused to emphasize that if a person associates with people of questionable character or behavior, they are likely to adopt those negative qualities themselves
1
a goose quill is more dangerous than a lion's claw
sentenceused to imply that the written word can be more influential and powerful than physical force or violence
2
evil communications (more often than not) (tend to) corrupt good manners
sentenceused to emphasize that bad company or associations can negatively influence a person's behavior and character
3
he that / who touches pitch shall be defiled
sentenceused to warn that if someone engages in something that is considered wrong or immoral, they are likely to be negatively impacted by it, resulting in a loss of reputation or moral standing
4
the rotten apple / tooth injures its neighbors
sentenceused to imply that a person with bad character or behavior can negatively influence and harm the ones around them
5
rotten / bad apple spoil the (whole) barrel / bushel / bunch
sentenceused to imply that a single bad or negative element within a group can have a harmful or corrupting influence on the entire group, leading to a decline in overall quality or integrity
6
bad company corrupts good morals
sentenceused to imply that associating with people who have bad habits or engage in immoral behavior can negatively impact one's own values and behavior
7

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