extra noun
ADJ. little There was no money left over for luxuries or little extras. | optional | hidden £400 is a lot to pay for a weekend break, but there are no hidden extras. | added Regular guests also get added extras like free room service.
EXTRA + VERB include sth Optional extras include anti-lock brakes and an electric sunroof.
You can also check other dicts: extra (English, 中文解释 ), wordnet sense, Collins Definition