buffer
noun
an apparatus at the end of a railroad car, railroad track, etc., for absorbing shock during coupling, collisions, etc.
Used to describe an ongoing action or state that is currently taking place in the immediate present.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
In the poem, Smith wonders what the police are buffering themselves against.
From New York Times ● Apr. 10, 2018