Wiktionary
behind the bit
prep.phr. (context idiomatic of a horse English) Evading the bit.
Usage examples of "behind the bit".
The flowers were an especially odd touch, and I never really understood whether it was you or Mask behind the bit with the blue stones.
They'd have to keep behind the bit of wall that the old crew had begun on.
The plant was quite well developed before any of us bothered to notice it, for it had taken root along with a number of other casuals behind the bit of hedge that screened the rubbish heap.