reducer

plural reducers

1. Something or someone that reduces.

   If a floorboard has deep risers, you should use an entrance reducer in winter, to help keep out mice […]

   2018, Andrew Matheson, Murray Reid, Practical Beekeeping in New Zealand: The Definitive Guide, page 35

2. chemistryA reducing agent.
3. engineeringA hydraulic device for reducing pressure and hence increasing movement, used to transmit the load from the hydraulic support of the lower shackle to the lever weighing apparatus in some kinds of heavy testing machine.
4. artsA liquid used in the process of developing a negative to reduce its darkness.
5. A component used to connect two things of different sizes.

   This reducer ring allows an E27 lampshade to be used on a B22 light fitting.

   1. businessA component used to connect two pipes of different bores.
6. computingA function that takes state and action as arguments and returns the next state of the app.
7. ball gamesThe reduction of the contribution to a football game of a more talented opponent by intimidation using a brutal tackle.

   Koulibaly flattens Steven Bergwijn with a reducer from behind but avoids a booking. Bergwijn gets to his feet and blows his cheeks in frustration. I think that really hurt but he doesn’t want to show it.

   2022 November 21, Barry Glendenning, “Live Feed: Senegal v Netherlands”, in The Guardian, archived from the original on 03 Dec 2022