To cover, to atone, to make reconciliation, to purge
Brown-Driver-Briggs
1) to cover, purge, make an atonement, make reconciliation, cover over with pitch 1a) (Qal) to coat or cover with pitch 1b) (Piel) 1b1) to cover over, pacify, propitiate 1b2) to cover over, atone for sin, make atonement for 1b3) to cover over, atone for sin and persons by legal rites 1c) (Pual) 1c1) to be covered over 1c2) to make atonement for 1d) (Hithpael) to be covered