Spur (on)
(Other definitions for motivate that I've seen before include "Prompt" , "Stimulate to action" , "Give an incentive for action" , "Stimulate the interest of" , "Drive on" .)
(Other definitions for egg that I've seen before include "Poached or boiled?" , "Item of food" , "It, or chicken, first?" , "Bomb or mine (sl.)" , "Urge on the breakfast dish" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spur on</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for encourage that I've seen before include "Egg on" , "Give support to, stimulate hope" , "Give hope to (someone)" , "Spur on, inspire" , "Hearten, inspire" .)
(Other definitions for forward that I've seen before include "Fresh" , "Ahead; impertinent" , "advance" , "Send on; football player" , "Presumptuous" .)