a handle or wheel used for controlling the direction in which a boat or ship moves 舵柄；舵轮 Word OriginOld English helma.
Idioms
at the helm
in charge of an organization, project, etc. 负责；掌管 My husband was at the helm. 我丈夫是掌舵人。
controlling the direction in which a boat or ship moves 开始掌舵 The skipper remained at the helm all night. 船长整晚都在掌舵。
take (over) the helm
to take charge of an organization, project, etc. 担任领导人；掌管 Lucenti took over the helm when the previous director retired. 前任董事退休后，Lucenti接管了公司。
to begin controlling the direction in which a boat or ship moves 开始掌舵