▪ I. rein rein 1 [reɪn] noun
1. keep a tight rein on something to control something strictly:
• The finance director keeps a tight rein on spending.
2. take/hand over the reins to take or give someone control over an organization or country:
• I only took over the financial reins three weeks before the end of the financial year.
[m0] ▪ II. rein rein 2 verb
rein something → in also rein something → back phrasal verb [transitive]
to start to control something more strictly and stop it from increasing:
• The government is reining in public expenditure.
• Surely the Treasury will want to rein back inflation?
* * *
rein UK US /reɪn/ noun
Financial and business terms. 2012.