verb, lagged, lag⋅ging, noun | 1. | to fail to maintain a desired pace or to keep up; fall or stay behind: After five minutes of hard running, some of them began to lag. |
| 2. | to move or develop slowly, as toward a goal or objective, or in relation to an associated factor (often fol. by behind): to lag behind in production. |
| 3. | to delay or fail in reaching full development: The factory lags regularly in making its quota. |
| 4. | to hang back; linger; delay: The old friends lagged because they wanted to talk some more. |
| 5. | to decrease, wane, or flag gradually, as in intensity: Interest lagged as the meeting went on. |
| 6. | Marbles. to throw one's shooting marble toward a line (lag line) on the ground in order to decide on the order of play. |
| 7. | Billiards, Pool. string (def. 17b). |
| 8. | to fail to keep up with: The industry still lags the national economy. |
| 9. | Obsolete. to cause to lag. |
| 10. | a lagging or falling behind; retardation. |
| 11. | a person who lags behind, is the last to arrive, etc. |
| 12. | an interval or lapse of time: There was a developmental lag in the diffusion of ideas. |
| 13. | Mechanics. the amount of retardation of some motion. |
| 14. | Electricity. the retardation of one alternating quantity, as current, with respect to another related alternating quantity, as voltage, often expressed in degrees. |
| 15. | Marbles, Billiards. the act of lagging. |

noun, verb, lagged, lag⋅ging.| 1. | one of the staves or strips that form the periphery of a wooden drum, the casing of a steam cylinder, or the like. |
| 2. | Masonry. a crosspiece between ribs in a centering. |
| 3. | to line or cover (an excavation) with lagging. |
| 4. | to cover with insulation, as a steam boiler, to prevent radiation of heat. |

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