Sign off and Step down

Sign off verb - Cease broadcasting; get off the air; as of radio stations.

Step down and sign off are semantically related in give up responsibility topic. In some cases you can use "Step down" instead a verb "Sign off".

Step down verb - Give up or retire from a position.

Sign off and step down are semantically related in resign topic. Sometimes you can use "Sign off" instead a verb "Step down".