first aid noun
ADJ. emergency
VERB + FIRST AID administer, give While one of you gives first aid, the other should call an ambulance. | receive | be trained in At least one member of staff should be trained in first aid.
FIRST AID + NOUN box, kit, manual | course | post Medics were bringing casualties to the first-aid post.
You can also check other dicts: first aid (English, 中文解释 ), wordnet sense, Collins Definition