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1[countable, usually plural] a long, narrow, leather band that is attached to a bit (= a metal bar in a horse's mouth) and is held by the rider in order to control the horse She pulled gently on the reins.
- 2the reins [plural] the state of being in control or the leader of something It was time to hand over the reins of power (= to give control to someone else). The vice president was forced to take up the reins of office. Idioms
give/allow somebody/something free/full rein, give/allow free/full rein to something jump to other results
to control someone or something carefully or strictly It's essential to keep a tight rein on public spending.
Check pronunciation: rein