accessory noun
1 extra item
ADJ. essential, perfect, useful This silk scarf is the perfect accessory for stylish summer evenings. | bathroom, car, fashion
2 person who helps in crime
PREP. ~ to an accessory to murder
PHRASES an accessory before/after the fact (= a person who knows about a crime before/after it was committed and protects the criminal) (law) If you were lying to the police, then you have been an accessory after the fact for all these years.
You can also check other dicts: accessory (English, 中文解释 ), wordnet sense, Collins Definition