1) An iron crowbar or lever, noted regularly from the fourteenth century.
1396-7 et in j gawelok de ferro emp. 2s, Ripon
1425 gavelockes, mattokes and wegges, Scarborough
1544 for ... amending of gavelocks, Bridlington
1581 one gavellocke, 3 spades, Anston
1697 the bayliffe answered they would break open the doore and having a gaivelack ready Baines broke open the doore, Bentham. It was used for heavy labour in a variety of situations.