Cover-up and Wall off

Cover-up noun - Something that covers or conceals like a piece of cloth.

Wall off and cover-up are semantically related. In some cases you can use "Wall off" instead a verb phrase "Cover-up".

Wall off verb - To disallow entry into (a place) by means of a physical barrier at the entry point.

Cover-up and wall off are semantically related. Sometimes you can replace phrase "Cover-up" with "Wall off", this terms are similar.