Related Clues:

• E-mail command
• Comeback
• Do a double take
• Behave
• Make a move
• Slam on the brakes, e.g.
• Get back
• Do a double take, e.g.
• Do something
• Take countermeasures
• Answer an invitation
• E-mail option
• Flinch, say
• Change chemically
• Push back, perhaps