Compounds of 乾す

• 乾す
  (v5s,vt) (1) to air
  to dry
  to desiccate
  (2) to drain (off)
  (3) to drink up
  (4) to deprive of a role, job, etc. (usu. in the passive)
• 飲乾す
  (io) (v5s,vt) to drink up
  to drain (cup)
• 飲み乾す
  (v5s,vt) to drink up
  to drain (cup)