rebar

Short definition from Wiktionary

Noun

1. 1
   A steel reinforcing bar in a reinforced concrete structure.
2. 2
   A grid-shaped system of such bars.

Verb

1. 1
   To reinforce with bars of this kind.
2. 2
   To bar again.
3. 3
   To redistribute the notes of a musical score across the bars, e.g. when changing time signature.