Mǽr-pytt

According to the Old English Dictionary:

es;

mǽr-pytt

m. A pit that forms part of a boundary (?) :-- On ðone mǽrpyt; of ðam pytte, Cod. Dip. Kmbl. iii. 439, 1. Eást tó mǽrpytte, ii. 250, 5. mær-pytt