Abarim Publications' online Biblical Hebrew Dictionary
The root-verb רפד (rapad), meaning to spread or support, is not a verb that's used very often. It occurs in Job 41:22, where a crocodile spreads a mark on the mud, and 17:13 where the author spreads his bed in Sheol. In the Song of Solomon 2:5 the bride exclaims her wish to be "supported" (refreshed?) with apples.
This verb's sole derivative is the feminine noun רפידה (repida), apparently denoting some kind of rest or support structure (Song of Solomon 3:10).