A lot of people have been cued to "spread the bar" or "pull the bar apart" when overhead in the snatch. I'm not a big fan of this cue, because in my mind, the effort to pull a bar apart means gripping it tightly. A tight grip on the bar overhead and/or as you're trying to finalize the lockout will slow the elbow extension down and limit how well the elbows can ext
end.

If you want to think of spreading the bar, do it by pushing the bar apart through youir palms. Push the palms to the sides away from the elbows and keep the grip loose. This idea of pushing will also help you flip the hands and secure the bar overhead as you transition from pulling under the bar to punching down under it when receiving the snatch.