accomplice
The Italian word 'complice' is used similarly to the English word 'accomplice', and usually refers to someone who assists in or is involved in a wrongdoing or crime. It can also be used more broadly to indicate someone who helps another in any kind of task or endeavor.
You are my accomplice in this plan.
In this sentence, 'complice' is used to indicate a person who is knowingly helping another in a potentially unlawful or immoral plan or activity.
Silence is the perfect accomplice.
The word 'complice' here refers to a metaphorical concept. It implies that silence, unlike a person, can also be seen as an accomplice, especially in wrongdoings by aiding or benefiting the person remaining silent.
They acted as accomplices, not as enemies.
In this context, 'complici' shows that people were working together, supporting each other in some action, rather than opposing each other. Thus 'complici' here refers to cooperative action, possibly in a negative situation.