lag1
Pronunciation: /lag/
verb ( lags, lagging, lagged)
- 1fail to keep up with another or others in movement or development: they waited for Tim who was lagging behind
- 2North Americananother term for string (sense 6 of the verb).
noun

Origin:
early 16th century (as a noun in the sense 'hindmost person in a game, race, etc.', also 'dregs'): related to the dialect adjective lag (perhaps from a fanciful distortion of last1, or of Scandinavian origin: compare with Norwegian dialect lagga 'go slowly')