A rent or opening in a wall (Ezek. 13:5; Comp. Amos 4:3). The false prophets did not stand in the gap (Ezek. 22: 30), i.e., they did nothing to stop the outbreak of wickedness.

Noah Webster's New International Dictionary of the English Language

1. (n.) An opening in anything made by breaking or parting; as, a gap in a fence; an opening for a passage or entrance; an opening which implies a breach or defect; a vacant space or time; a hiatus; a mountain pass.

2. (v. t.) To notch, as a sword or knife.

3. (v. t.) To make an opening in; to breach.