noun / verb
funnel
FUHN-uhl/ˈfʌnl/
A tapering passage that channels material into a narrow outlet.
The funnel guides water from the measuring jug into the bottle's narrow neck.

Etymology
Latin fundibulum named a funnel or hopper and was ultimately based on a verb meaning 'pour in.' The name describes the tool's job of directing liquid into a narrow opening.
In context
that funnel that's actually moving that runoff into a catch jar
More examples
- The funnel channels grain into a sack below.
- He funnels the juice into small jars.
- The barriers funnel pedestrians toward a single entrance.
Forms
funnel · funnels · funneled · funneling