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Reducer

//ɹɪˈdusɚ// noun

Noun

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 […]"
2
pipefitting that joins two pipes of different diameter wordnet
3
A reducing agent.
4
a substance capable of bringing about the reduction of another substance as it itself is oxidized; used in photography to lessen the density of a negative or print by oxidizing some of the loose silver wordnet
5
A 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.

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6
A liquid used in the process of developing a negative to reduce its darkness.
7
A component used to connect two pipes of different bores.
8
A function that takes state and action as arguments and returns the next state of the app.
9
The 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."

From reduce + -er.

Unscramble this word: reducer