Rein is both a noun and a verb for guiding and restraining. You can use the long strap, or rein, on a horse to control its speed and direction, and you can rein in your own tongue by closing your mouth.

Rein rhymes with rain but the two words describe very different things. Rain comes down all over the place, uncontrolled, while a rein holds things in place or controls what comes out. As a noun, rein is often used as a plural word "reins" when talking about actual leather restraints used in horse riding, but a rein also is something non-physical like when you put a rein on spending by shopping less.

Definitions of rein

n one of a pair of long straps (usually connected to the bit or the headpiece) used to control a horse

bearing rein, checkrein
a rein designed to keep the horse's head in the desired position
leading rein
rein to direct the horse's head left or right
Type of:
an elongated leather strip (or a strip of similar material) for binding things together or holding something in position

n any means of control

“he took up the reins of government”
Type of:
power to direct or determine

v control and direct with or as if by reins

rein a horse”
draw rein, harness, rein in
Type of:
command, control
exercise authoritative control or power over

v stop or check by or as if by a pull at the reins

“He reined in his horses in front of the post office”
rein in
rein in to keep from winning a race
Type of:
cause to stop

v keep in check

harness, rule
Type of:
bound, confine, limit, restrain, restrict, throttle, trammel
place limits on (extent or access)

v stop 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”
rein in
Type of:
halt, stop
come to a halt, stop moving

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