Definitions of draw in:

• verb:   pull inward or towards a center
• verb:   advance or converge on
• verb:   draw in as if by suction
• verb:   remove as if by suction

  Example: "Draw in air"

• verb:   shape one's body into a curl
• verb:   move into (a station) of trains
• verb:   direct toward itself or oneself by means of some psychological power or physical attributes