lag

Concise Oxford English Dictionary © 2008 Oxford University Press:
lag1

▶verb (lags, lagging, lagged)

• 1 fall behind; follow after a delay.

• 2 N. Amer. another term for string (in sense 6).

▶noun (also time lag) a period of time between two events; a delay.

– derivatives
lagger noun.

– origin C16 (as n. in the sense ‘hindmost person’): rel. to the dial. adj. lag (perh. from a fanciful distortion of last1, or of Scand. origin).

Concise Oxford English Dictionary © 2008 Oxford University Press:
lag2

▶verb (lags, lagging, lagged) enclose or cover (a water tank, pipes, etc.) with insulating material.

– derivatives
lagger noun.

– origin C19: from earlier lag ‘piece of insulating cover’.

Concise Oxford English Dictionary © 2008 Oxford University Press:
lag3

▶noun Brit. informal a habitual convict.

– origin C16: of unknown origin.