go long

Short definition from Wiktionary

Verb

1. 1
   Used other than figuratively or idiomatically: see go, long.
2. 2
   To buy a financial product, such as a share, so as to profit from a rise in its value; compare go short.
3. 3
   To run far from the person throwing a ball in order to receive a long pass; (especially American football, Canadian football) to run down the field away from the quarterback to receive a long or Hail Mary pass.