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Can "filter for x" be used in two opposite senses?

English Language & Usage Asked on March 17, 2021

Can "filter for" be used in the following sense:

"ABC is very important as it filters for high quality and reliable results."

Filter for has been used as filter out:

"8. to act as a filter for; to slow or partially obstruct the passage of." (The Free Dictionary)

I am aware that filter on its own is ambiguous; see Sieve vs filter? Are they opposites?

This question is specifically about "filter for" and its second usage (where it’s followed by the desired state).

One Answer

As per Lexico:

filter: Process or assess (items) in order to reject those that are unwanted. ‘you'll be put through to a secretary whose job it is to filter calls’

It's fine to say filter for with the understanding that the filter is removing low-quality and unreliable results, as noted by @JasonBassford. You might want to consider this slight rewrite of your example sentence:

ABC is very important filter for high quality and reliable results.

But again, this means that the filter rejects low-quality and unreliable results.

Answered by Richard Kayser on March 17, 2021

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