In the context of project financing, the amount of capital expenditures or funding above the original estimate to complete the project. Bloomberg Financial Dictionary

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I. overrun o‧ver‧run 1 [ˈəʊvərʌn ǁ ˈoʊ-] noun [countable]
1. also cost overrun ACCOUNTING an occasion when something costs more to develop and produce than was originally planned, or the amount of money involved in this:

• The Pentagon is expecting overruns of as much as $2.6 billion on its cargo plane program.

• Almost from the start, the cost overruns were as staggering as the project itself.

2. MANUFACTURING an extra quantity of things that is produced, which may not be needed:

• production overruns

  [m0] II. overrun o‧ver‧run 2 [ˌəʊvəˈrʌn ǁ ˌoʊ-] verb overran PASTTENSE [-ˈræn] overrun PASTPART [intransitive, transitive] ACCOUNTING MANUFACTURING
to cost more or continue longer than expected or intended:

• The health service ended up subsidising the venture because the costs overran.

• Businesses refused to commit themselves in case the project's costs overran its budget.

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overrun UK US /ˌəʊvəˈrʌn/ verb [I] (overrunning, overran, overrun)
to continue past an agreed or expected limit, especially a finishing time or a cost: »

Analysts say the cost of the improvements are bound to overrun.

overrun by 10 minutes/2 weeks/$1 million, etc. »

The 45 minutes allocated for the briefing overran by almost 30 minutes.

overrun UK US /ˈəʊvəˌrʌn/ noun [C or U]
the fact that something has cost more money or taken more time than planned, or the additional amount of money or time spent: »

He expects the department to cover this year's overrun by moving money from development.

an overrun of sth »

We found projects had an average time overrun of 17%.

See also COST OVERRUN(Cf. ↑cost overrun)

Financial and business terms. 2012.