What does the word lock mean?

Usage examples for lock

  1. This man said it would be better to take him back to the last lock, and they began to argue about who should carry him. – The Untilled Field by George Moore
  2. " Do show me a lock of her hair," said Fanny, laughing. – The Claverings by Anthony Trollope
  3. She could lock her door, of course. – Leonore Stubbs by L. B. Walford