Abarim Publications' online Biblical Hebrew Dictionary
ערש
The verb ערש ('rs) isn't used in the Bible, so we don't know what it may have meant. But judging from its sole extant derivative, it may have had something to do to recline. The feminine noun ערש ('eres) means couch, divan or bed (Deuteronomy 3:11, Amos 3:12).