I.up [美 əp, 英 ʌp]副up often appears as the second element of certain verb structures in English (back up, pick up, sit up, etc). For translations, see the relevant verb entry (back, pick, sit, etc).
Like their relatives the honey bees, bumblebees feed on nectar, using their long hairy tongues to lap up the liquid; the proboscis is folded under the head for flight.