Entry 1 sense Webster, 1913 Seep /sēp/ · IPA /siːp/ 01 v. i. To run or soak through fine pores and interstices; to ooze. 1. To run or soak through fine pores and interstices; to ooze.[Scot. & U. S.] “Water seeps up through the sidewalks.” — G. W. Cable.