5. the pendulum (of something)= used for talking about the tendency of an opinion or situation to change from one position or condition to its opposite
e.g. The pendulum has swung back in favour of stricter penalties.
6. calibrate= 01 to check or slightly change an instrument or tool, so that it does something correctly
02 to mark an instrument or tool so that you can use it for measuring
7. integral= necessary= forming an essential part of something and needed to make it complete
an integral part (of something): Home visits by staff are an integral part of the service.
integral to: The scene isn’t really integral to the plot.
an integral element/feature: Collaboration was becoming an integral element of their teaching strategy.
