I.down1[美 daʊn, 英 daʊn]副down often appears as the second element of certain verb structures in English (back down, clamp down, tone down, etc). For translations, see the relevant verb entry (back, clamp, tone, etc).
Wooden flying buttresses were applied to the sides and rear, to ensure rigidity, and ropes were used to tie down the whole structure onto steel pickets driven into the ground.
The holding group would be positioned on either flank of the combat zone to tie down enemy reinforcements via means of diversion attacks or blocking defence.