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filter down

1. (literally) Of a liquid, to slowly seep down through lower substrate levels. The company bottles rainwater that has filtered down through seven layers of volcanic rock, purifying it and enriching it with minerals.
2. (by extension) Of information, resources, communication, etc., to move slowly and in small amounts down to lower levels of people in an organization, population, or group. It always takes a dog's age for any important company information to filter down to me and the other interns. The government has approved a staggering $200 billion stimulus package, but some experts warn it could be years before that money filters down to individuals and smaller businesses.
See also: down, filter

filter up

Of information, resources, communication, etc., to move slowly and in small amounts up to higher levels of people in an organization, population, or group. Local think-tanks are developing new, pragmatic strategies to deal with the burgeoning housing crisis, but they are unlikely to filter up to the agenda of state lawmakers anytime soon.
See also: filter, up


A common hashtag on the social media and photo-sharing platform Instagram for pictures that have not been altered with the variety of filters offered in the app. What a gorgeous sunset tonight. #nofilter

filter out

To keep something from being known or experienced. A noun or pronoun can be used between "filter" and "out." These must not be noise-canceling headphones because they're not filtering out any of conversations currently going on around me in the coffee shop.
See also: filter, out

filter through (something)

To move or pass through some thing. No, it won't be too dark in here—a good amount of light will still filter through these sheer curtains.
See also: filter, through

filter in

 (to some place)
1. Lit. to leak or seep into some place. The smell of bacon cooking filtered into his room and made him wake up. The smoke filtered in and burned our eyes.
2. Fig. [for people] to come into a place, a few at a time, over a period of time. One by one, the guests filtered into the room. They filtered in and started on the snacks.
See also: filter

filter something out of something

 and filter something out
to remove something from a fluid by running it through a filter. We filtered the odors out of the water and made it fit to drink. I'm glad you filtered out the odor.
See also: filter, of, out

filter through (something)

to pass or seep through something. The water filtered through the coffee grounds and dripped into the pot. The clear water filtered through and left the sand behind.
See also: filter, through

filter down

To pass or spread downward from an upper level to lower levels, as through a filter: The information slowly filtered down from management to the hourly employees.
See also: down, filter

filter out

To prevent something from passing through, being communicated, or being perceived: My new glasses filter out ultraviolet rays. These headphones filter unwanted noise out.
See also: filter, out

filter through

To be allowed to pass through something or to find a way through something, especially an obstacle: The sunlight filtered through the thin curtains.
See also: filter, through

bozo filter

n. a setting on an internet email reader that will filter out selected annoying people. (Refers to bozo, a jerk.) Welcome to my bozo filter, jerk!
See also: bozo, filter
References in periodicals archive ?
Only filterer and scraper functional groups showed no relationship between secondary production and standing crop of leaf litter for the mixed substrates (Table 12).
Significant increases were observed only for pooled gatherers and filterers and not for individual taxa.
A House committee that reports out a bill under this rule plays the role of the filterer, with the entire House the chooser.
Because the filterer runs at discrete times, if documents could be removed, different users could receive different results from the same filter, depending on when the filter ran relative to document deletion.
Whereas filterers and Chironomidae numerically dominated in both treatments, in terms of biomass the relative importance of collector + scrapers, predators and shredders increased in relation to Chironomidae (Figure 5).
Regarding the specimen participation in each functional group, predators were the most representative with 971 individuals captured in ORP, 810 in IRP and 1,090 in CRP, follow by the collectors group with 819 specimens sampled in ORP, 956 in IRP and 993 in CRP and the filterers with 617 individuals captured in ORP, 602 in IRP and 804 in CRP.
The lowest index values were recorded for niche overlap between predators and trophic groups corresponding to collector filterers and shredder-herbivores.
Tested metrics were: 6 Richness Metrics-Total taxa, Family taxa, Ephemeroptera taxa, Plecoptera taxa, Trichoptera taxa, Ephemeroptera + Plecoptera + Trichoptera (EPT) taxa; 7 Composition Metrics--% Coleoptera, % Ephemeroptera, % Plecoptera, % Trichoptera, % Odonata, % Diptera and % EPT; 4 Tolerance Metrics-IBE-IOC, BMWP-CETEC, Baetidae/Ephemeroptera, EPT/Chironomidae; and 5 Trophic Metrics-% Shredders, % Collectors, % Predators, % Filterers, % Scrapers.
Filterers, for example, are not restricted to feeding on fine particulate organic matter that collects in their nets.