UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈpiːkəˌbuː/US:USA pronunciation: respellingUSA pronunciation: respelling(pēkə bo̅o̅′)

WordReference Random House Unabridged Dictionary of American English © 2020
peek•a•boo  (pēkə bo̅o̅′),USA pronunciation n. 
  1. GamesAlso called  bo-peep. a game played by or with very young children, typically in which one covers the face or hides and then suddenly uncovers the face or reappears, calling "Peekaboo!''

  1. Clothing
    • decorated with openwork.
    • made of a sheer and revealing material, as some blouses for women.
  2. appearing briefly and then vanishing, or promising to appear but failing to do so:the fluctuating response of the stock market to a peekaboo economic recovery.
  • peek + -a- connective + boo1 1590–1600

Collins Concise English Dictionary © HarperCollins Publishers::
peekaboo /ˈpiːkəˌbuː/ n
  1. a game for young children, in which one person hides his face and suddenly reveals it and cries "peekaboo."
  1. (of a garment) made of fabric that is almost transparent or patterned with small holes
Etymology: 16th Century: from peek + boo
'peekaboo' also found in these entries (note: many are not synonyms or translations):
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