Open English Wordnet
Nouns
(n)reinone of a pair of long straps (usually connected to the bit or the headpiece) used to control a horse (n)reinany means of control“he took up the reins of government” Verbs
(v)rein, rein instop or slow up one's horse or oneself by or as if by pulling the reins“They reined in in front of the post office” (v)rein, rein instop or check by or as if by a pull at the reins“He reined in his horses in front of the post office”