Compounds of 空で

• 空で
  (exp) (1) off the top of one's head
  from thin air
  (2) from memory
• 空で歌う
  (exp) to sing from memory
• 空で言う
  (exp) to speak from memory
• 空で読む
  (exp) recite from memory
• 空で覚える
  (exp) to learn by heart (rote)
  to memorize
  to memorise