ADJ. fine, narrow, thin | broad | hollow | flexible | closed, sealed | inner (= in a bicycle tyre) | fluorescent (= a kind of light) | aluminium, cardboard, copper, glass, metal, plastic, steel | discharge, drainage, suction | test | breathing, feeding, ventilation | capillary, bronchial, Fallopian, neural
PREP. down a/the ~ pouring the liquid down the tube | in/into a/the ~ I put the poster back into its tube. | through a/the ~ He gave the lamb its food through a tube. | up a ~ 2 the tube the Underground
VERB + TUBE go on, take, travel by/on
TUBE + NOUN line, station, ticket, train
PREP. by ~ I go to work by tube. | on the ~ I bumped into him on the tube.