D defs.my
Entry 2 senses Webster, 1913

Berm

/bẽrm/ · IPA /bɜː(ɹ)m/
01 n. A narrow shelf or path between the bottom of a parapet and the ditch.
  1. 1.
    A narrow shelf or path between the bottom of a parapet and the ditch.(Fort.)
  2. 2.
    A ledge at the bottom of a bank or cutting, to catch earth that may roll down the slope, or to strengthen the bank.(Engineering)