hold-down

/HH OW1 L D D AW1 N/
noun
  1. 1

    A clamping device that holds another structural element in place.

  2. 2

    A period during which a network router ignores messages about a currently unreachable route, giving it time to become reachable again.

Source: https://en.wiktionary.org/wiki/hold-down, https://en.wiktionary.org/wiki/holddown