We found one dictionary that defines the word keep a close rein on:

Miscellaneous (1 matching dictionary)

1. keep a close rein on: Idioms

▸ Words similar to keep a close rein on ▸ Usage examples for keep a close rein on ▸ Idioms related to keep a close rein on ▸ Wikipedia articles (New!) ▸ Words that often appear near keep a close rein on ▸ Rhymes of keep a close rein on ▸ Invented words related to keep a close rein on