Politically, she tends to 'go against the tide' on her college campus. [=she tends to have different political opinions than most people on her college campus]
He became involved in social issues at the 'high tide' of the civil rights movement. [=at the most active and important time of the civil rights movement]
The team was on a losing streak, but then 'the tide turned' [=their luck changed] and they went on to win the championship.
(..) ...tomorrow. Dragon classifications. Strike class. Fear class. Mystery class. Thunderdrum. This reclusive dragon inhabits sea caves and dark tide pools. When startled, the Thunderdrum produces a concussive sound that can kill a man at close range. Extremely dangerous. Kill on sight. (..)2010 How to Train Your Dragon