('US') She shifted 'into' low/high 'gear'. = ('Brit') She changed 'into' bottom/top 'gear'. [=she changed to a gear that allows for a slower/faster rate of speed]
This discovery will bring about a 'paradigm shift' in our understanding of evolution. [=will cause people to understand evolution in a completely new way]
We need to 'shift ourselves' [='get moving'] if we're going to make it home before dark.
(..) gonna summon him to us? - Yeah, that's what I was thinking. - What's the rush? Well, not that it's any of your business, but Greg's shift starts in a few hours and I won't see him for three days. So I'm gonna go call him and I'd put the genie back in the bottle, just to be safe, no offense. (..)2004 TvShow: Charmed Title: I Dream of Phoebe Season: 6 Episode 15