a-crock|əˈkrɒk| [Fr.à croc.] With a prop or support; in arquebus-a-crock, musket-a-crock. 1615Sandys Travels 153 Wherein are certaine harquebuses acrock for the safe-guard of the harbour.1634T. Herbert Travaile 15 The Sentinell with his musquet acrocke was set to guard it.