('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.
(..) his burial is at noon tomorrow. Daniel, this accident could have been avoided. It is terrible to think of that well -working away out there... -These men work in -hour shifts. -...unblessed. -They need their rest. If they don't have it, they start to make stupid mistakes. (..)2007 There Will Be Blood