n.

1. 舵，舵柄，舵轮[C]
2. （政府、组织等的）领导地位[the S]
   How long has that man been at the helm?

   那人掌权多久了？

vt.

1. 给……掌舵；指挥

n.

1. a tiller or wheel for steering a ship or boat.
2. (the helm) a position of leadership.

v.

1. steer (a boat or ship).
2. manage the running of.
   ▸N. Amer. direct (a film).

n.