another kettle of fish —(also: different kettle of fish, a) a completely different matter or situation:
- I’d driven an automatic for years but learning to handle a car with gears was another kettle of fish altogether.
another turn of the screw—an action which makes a bad situation worse, especially in order to force a person to do smth.:
- Each letter from my bank manager was another turn of the screw.
Note: Neither expression correlates in meaning with the phrase another side on the boat—an alternative way of doing smth.:
- There is another side on the boat; you don’t have to do it that way.
See also: other side of the coin, the / other side of the hill, the.