increep means to creep in; to make a furtive entrance.
Etymology
From in- + creep.
verb
- To creep in; to make a furtive entrance.“1849, Henoch Clapham, quoted in Jane Eliza Leeson, Chapters on Deacons
First, order gone, and doores not being kept, / By baptisme heaps of prophane do rush. / With them, at length, a ministry incrept, / That with the horn God's ordinance did push.”