Definition of head-scratching in English:

head-scratching

noun

  • The action of scratching one's head, especially in puzzlement or thought; an instance of this. Hence: perplexity; deep thought. Compare to scratch one's head.

adjective

  • 1Of a question, situation, etc.: such as might cause one to scratch one's head in puzzlement, thought, etc.; specifically baffling, perplexing.

  • 2That scratches one's head, especially in puzzlement.

Origin

Mid 19th century; earliest use found in Blackwood's Magazine. From head + scratching<br>early 19th century; earliest use found in Western Monthly Review. From head + scratching.

Pronunciation

head-scratching

/ˈhɛdˌskratʃɪŋ/