Definition of overclose in US English:

overclose

verb

  • 1with object To close beyond a certain limit, angle, or alignment. Cf overclosure. Also without object rare.

  • 2with object Astronomy. Of cosmological models and physical theories, or assumptions affecting them: to cause (the modelled universe) to have a greater mass than is estimated to be contained in it in reality or that can be reconciled with its observed expansion.

Origin

Late Middle English (in an earlier sense). From over- + close.

Pronunciation

overclose

/ˌəʊvəˈkləʊz/