zigged when one should've zagged

(one) zigged when (one) should have zagged

1. One moved in a particular direction but should have moved in a different direction in order to avoid some obstacle or impediment. A reference to moving from side to side in a zigzag pattern. A: "The running back had the chance to break away for a touchdown, but he was brought down by the other team's linebacker in a bone-crunching tackle." B: "Yep, looks like he zigged when he should have zagged." I nearly beat the final boss of the game, but I zigged when I should have zagged at the very last moment and he ended up killing me.
2. By extension, one acted in a way that resulted in a worse outcome than if they had done something different. Everyone assumed that it was an open-and-shut case, but the prosecution's controversial decision not to question the company's CEO is leaving many wondering if they zigged when they should have zagged. He really should have won the election, but he zigged when he should have zagged by focusing so much of his campaign on taxes instead of attacking his opponent's political policies.
See also: have, should, zag, zig
Farlex Dictionary of Idioms.

zigged when one should've zagged

perfomed one deed when another deed would have been better; to do something inconsequentially different from another thing. I don't know why she complained. I guess I zigged when I should have zagged.
See also: one, zag, zig
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • (one) zigged when (one) should have zagged
  • zag
  • zagged
  • zig
  • go in the right direction
  • sway (from) side to side
  • sway from side to side
  • sway to and fro
  • sway back and forth
  • backward and forward