different between upfield vs downfield

English

up- +? field

upfield (comparative more upfield, superlative most upfield)

(sports) Away from the defending team's end of the playing field
(chemistry) Describing an NMR resonance at a lower frequency to that of a reference signal

upfield (comparative more upfield, superlative most upfield)

down- +? field

downfield (not comparable)

(sports) Toward the defending team's end of the playing field
(chemistry) Describing an NMR resonance at a higher frequency to that of a reference signal

downfield (not comparable)

Towards the lower part of a field
- "Still, he stole an occasional glance as the mule again worked its way downfield."

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