('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.
(..) three feet from our faces. And on the side of the shell is painted one word... Stark. We were trapped two days. Every effort to save us, every shift in the bricks, I think, "this will set if off." We wait for two days for Tony Stark to kill us. I know what they are. We will make it right. (..)2015 Avengers: Age of Ultron