birthday

birthday
birth‧day S1 W3 /ˈbɜːθdeɪ $ ˈbɜːr-/ noun [countable]
1. your birthday is a day that is an exact number of years after the day you were born:
    It’s my birthday on Monday.
    My aunt called to wish me a happy birthday.
    Anne’s birthday party
2. a day that is an exact number of years since an organization was established or an event first happened ⇨ anniversary:
    The City of Cleveland Orchestra is celebrating its 200th birthday.
3. in your birthday suit informal not wearing any clothes – used humorously
     

COLLOCATIONS

■ adjectives
   ▪ sb’s first/18th/40th etc birthday It’s Mum’s 50th birthday tomorrow.
   ▪ Happy Birthday! (=said to someone on their birthday) Happy Birthday, Linda!
■ verbs
   ▪ have a good/nice etc birthday Did you have a nice birthday?
   ▪ get something for your birthday What did you get for your birthday?
   ▪ celebrate sb’s birthday He will celebrate his 90th birthday on 25th August.
   ▪ remember sb’s birthday (=remember to send a card or present) She always remembers my birthday.
   ▪ forget sb’s birthday (=forget to send a card or present) Oh no! I forgot his birthday.
   ▪ give something to somebody for their birthday I never know what to give him for his birthday.
■ birthday + NOUN
   ▪ a birthday card Don’t forget to send her a birthday card.
   ▪ a birthday present Have you got Lou a birthday present yet?
   ▪ a birthday party Can you come to my birthday party next Saturday?
   ▪ a birthday cake She had a birthday cake with 21 silver candles on it.
   ▪ birthday celebrations the President’s 60th birthday celebrations
   ▪ a birthday treat (=something special you do on your birthday) What would you like to do for a birthday treat?
   ▪ a birthday meal Where are you going for your birthday meal?
   ▪ the birthday girl/boy informal (=the person whose birthday it is) Here comes the birthday girl!