Definition of upfield in English:
 upfield
adverb ʌpˈfiːldˈʌpfiːldˌəpˈfild
1(in sport) in or to a position nearer to the opponents' end of a field.
 he kicks the ball upfield
 Example sentencesExamples
-  Keaton needs to be more assertive to get the ball upfield quickly.
 -  All are quick and athletic, which should enable them to get upfield and make plays.
 -  He is a superb tackler of the ball, and is not afraid to roam upfield to cross the ball.
 -  They snatch the ball out of the air and accelerate upfield.
 -  Leigh Semblauk's speed was making a difference in getting the ball upfield and to a striker quickly.
 -  WR Kevin Dyson has been far more aggressive this season in heading upfield with the ball.
 -  The ball also generally bounces upfield, away from the end zone.
 -  Once again the rules allow the goalkeeper to ‘carry’ the ball inside his own penalty area and many do, right to the edge before kicking it upfield.
 -  Stephen King and Michael Munds had worked the ball upfield into the path of O'Neill, who made the inspired choice to venture forward.
 -  You catch the ball and try to get upfield as fast as you can.
 
2Physics 
In a direction corresponding to increasing field strength.