Funnel

Noun

 * 1) A vessel of the shape of an inverted hollow cone, terminating below in a pipe, and used for conveying liquids etc. into a close vessel; a tunnel.
 * 2) A passage or avenue for a fluid or flowing substance; specifically, a smoke flue or pipe; the chimney of a steamship or the like.

Verb

 * 1) To use a funnel.
 * 2) To proceed through a narrow gap or passageway akin to a funnel; to narrow or condense.
 * Expect delays where the traffic funnels down to one lane.

Thesaurus
adjutage, approach, asymptote, bottleneck, canalize, carry, catheter, center, centralize, channel, channelize, chimney, close, close in, close up, close with, collision course, come together, complex cone, concenter, concentralization, concentralize, concentrate, concentration, concourse, concurrence, conduct, cone, conelet, confluence, conflux, congress, conoid, converge, convergence, converging, convey, cop, cornet, crossing, drainpipe, efflux tube, fall in with, fire hose, flue, flue pipe, flume, focalization, focus, fumarole, garden hose, gas pipe, hose, hosepipe, hub, ice-cream cone, intersect, meet, meeting, mutual approach, narrow the gap, narrowing gap, nip, nipple, organ pipe, pinch, pine cone, pipe, pipeline, pipette, piping, put through, put through channels, radius, reed, reed pipe, run together, siamese, siamese connection, siphon, smokeshaft, smokestack, snorkel, soil pipe, spokes, stack, standpipe, steam pipe, stem, stovepipe, straw, tangent, tap, taper, traject, transmit, trench, tube, tubing, tubulation, tubule, tubulet, tubulure, unite, waste pipe, water pipe