Meaning of bumper-to-bumper

bump•er-to-bump•er

Pronunciation: (bum'pur-tu-bum'pur), [key]
— adj.
  1. marked by a long line of cars moving slowly or with many stops and starts, one behind the other: bumper-to-bumper traffic.
  2. following one another in profusion: bumper-to-bumper worries.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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