Definition of "rebar"

rebar¹

/ˈɹiː.bɑː(ɹ)/

noun
countable and uncountable, plural rebars
1. (countable) A steel reinforcing bar in a reinforced concrete structure.
  Quotations
  The floor and walls for Copthall tunnel have already been constructed using formwork into which rebar (reinforcing bar) was placed, and then concrete poured.
  2023 August 23, Chris Howe, “Green screen: HS2's route through the shires”, in RAIL, number 990, page 35
2. (uncountable) A grid-shaped system of such bars.
  Quotations
  The hash mark of rebar or the curve of a hubcap will create curious shapes to be decoded; even, perhaps, entire subway trains and lengths of tracks will remain.
  2020, David Farrier, “Thin Cities”, in Footprints, 4th Estate
verb
third-person singular simple present rebars, present participle rebarring, simple past and past participle rebarred
1. (transitive) To reinforce with bars of this kind.

/ɹiːˈbɑː(ɹ)/

verb
third-person singular simple present rebars, present participle rebarring, simple past and past participle rebarred
1. (transitive) To bar again.
2. (music, transitive) To redistribute the notes of a musical score across the bars, e.g. when changing time signature.