tie down

/T AY1 D AW1 N/
verb
  1. 1

    To constrain, or to confine within set limits.

  2. 2

    To secure as if with a rope or hook.

noun
  1. 1

    A rope, strap, chain, or line used to secure a load or item.

  2. 2

    The assembly to which something is secured using a tiedown.

  3. 3

    The act of securing something using a tiedown.

Source: https://en.wiktionary.org/wiki/tie%20down, https://en.wiktionary.org/wiki/tiedown