Definition of head-scratcher in English:

head-scratcher

noun

  • 1A person who scratches his or her head, especially in puzzlement or thought; (hence) a perplexed or thoughtful person. Compare to scratch one's head.

  • 2Informal (originally US). A perplexing problem or question; something which causes bafflement or puzzlement.

  • 3An implement for scratching the head. Now chiefly historical.

Origin

Early 17th century; earliest use found in Barten Holyday (1593–1661), Church of England clergyman and poet. From head + scratcher.

Pronunciation

head-scratcher

/ˈhɛdˌskratʃə/