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1. Literally, to take steps down from and off of something. Step off that table before you fall and crack your head open! I recognized her the moment she stepped off of the train.
2. To achieve an approximate measurement of some distance by counting the number of steps it takes to traverse it. In this usage, a noun or pronoun can be used between "step" and "off." My foot is almost exactly 12 inches in length, so I can just step off the border of the fence and we'll get a pretty close guess as to how long it needs to be. Step the width of this room off to see if the mattress will even fit in here.
3. slang To stop interfering or involving oneself with someone or something; to get away from someone or something. Used almost exclusively as an imperative. Step off, man, this is none of your business. You'd better step off right now before I knock your lights out.
step something off
to measure a distance by counting the paces required to cover it. she stepped the distance off and noted it on her pad. Liz stepped off the number of feet from the window to the opposite wall.
step off (of) something
to leave something elevated with one's first step. (Of is usually retained before pronouns.) she stepped off the bottom step and walked down the street. Tony stepped off of the bank and waded across the stream.
to come off something by taking a step. she came to the bottom step and stepped off. Ed was afraid to dive in from the side of the pool, so he just stepped off.
1. To take a step so that one is no longer on something: The politician stepped off the plane and waved to the crowd.
2. Slang To leave someone or something alone. Used chiefly as a command: Step off—I saw that clock first, and I'm going to buy it!