funnel

To proceed through a narrow gap or passageway akin to a funnel; to condense or narrow.

To channel, direct, or focus (emotions, money, resources, etc.).

To use a funnel.

To consume (beer, etc.) rapidly through a funnel, typically as a stunt at a party.

A utensil in the shape of an inverted hollow cone terminating in a narrow pipe, for channeling liquids or granular material; typically used when transferring said substances from any container into ones with a significantly smaller opening.

A passage or avenue for a fluid or flowing substance; specifically, a smoke flue or pipe; the chimney of a steamship or the like.

(figurative) Ellipsis of purchase funnel (“the process of customer acquisition conceptualized as a series of stages, from initial awareness (top) to sale or conversion (bottom)”).

Ellipsis of funnel cloud.