English to English

noun (n)

• a holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing(noun.artifact)

  Synonym:
  peg, pin, rowlock, thole, tholepin
  

  source: wordnet30
• The notch, fork, or other device on the gunwale of a boat, in which the oar rests in rowing. See Rowlock.(noun)

  source: webster1913