
der Zaum
bridle
A part of a horse's tack that is placed over the horse's head and used to steer and control it.
Der Reiter legte dem Pferd vorsichtig den Zaum an, bevor er aufstieg.
The rider carefully put the bridle on the horse before mounting.
bridle
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bridle
A part of a horse's tack that is placed over the horse's head and used to steer and control it.
Der Reiter legte dem Pferd vorsichtig den Zaum an, bevor er aufstieg.
The rider carefully put the bridle on the horse before mounting.

to keep in check
To control, restrain, or moderate someone or something, for example feelings or expenses.
Er musste seinen Ärger im Zaum halten, um die Situation nicht eskalieren zu lassen.
He had to keep his anger in check so as not to let the situation escalate.
'Der Zaum' (the bridle) is closely related to the verb 'zäumen' (to bridle), which means to put a bridle on a horse. The noun therefore describes the tool used for the action of the verb.
Bevor wir ausreiten, müssen wir die Pferde zäumen.
Before we go riding, we have to bridle the horses.
In the literal context with horses, 'der Zaum' (the bridle) is often used with the verbs 'anlegen' (to put on), 'abnehmen' (to take off), or 'führen' (to lead). You also say that you hold the 'Zügel' (reins, a part of the bridle) in your hand.
Der Bauer führte das Pferd am Zaum über den Hof.
The farmer led the horse by the bridle across the yard.
You can almost always recognize the figurative meaning by the fixed expression 'im Zaum halten' (to keep in check). Without this expression, 'der Zaum' (the bridle) usually refers literally to horse tack.
Es ist wichtig, die öffentlichen Ausgaben im Zaum zu halten.
It is important to keep public spending in check.
The expression 'im Zaum halten' (to keep in check) is often used for abstract things such as feelings, behaviors, or financial matters. Typical examples are: 'seine Wut im Zaum halten' (to keep one's anger in check), 'seine Neugier im Zaum halten' (to keep one's curiosity in check), 'die Kosten im Zaum halten' (to keep costs in check), or 'die Inflation im Zaum halten' (to keep inflation in check).
Sie versuchte, ihre Aufregung vor der Prüfung im Zaum zu halten.
She tried to keep her excitement before the exam in check.
rein / reins
Zaum and Zügel are both part of the equipment used to guide a horse. The Zaum is worn on the horse's head; the Zügel are the long straps attached to it that the rider holds in their hands.

Vor dem Losreiten legt die Reiterin dem Pferd den Zaum an.
Before riding off, the rider puts the bridle on the horse.
Vor dem Losreiten nimmt die Reiterin die Zügel in beide Hände.
Before riding off, the rider takes the reins in both hands.