Hot On Somebody's Heels Meaning

(idiomatic) Close behind; pursuing or following closely.

Example:   She left the restaurant with him hot on her heels.
2012 April 9, Mandeep Sanghera, “Tottenham 1 - 2 Norwich”[1], BBC Sport:
  Newcastle beat Bolton to increase the pressure on the Londoners, while Chelsea are also hot on the heels of faltering Tottenham, who have one win from their last eight games.