1lag 
/ˈlæg/ verb
lags; lagged; lag·ging /ˈlæg/ verb 1 [no obj] a : to move more slowly than others : to fail to walk or move as quickly as others — usually + behind ▪ One of the hikers kept lagging behind the rest of the group. ▪ We had to stop and wait because someone was lagging behind.
b : to be in a position that is behind others — usually + behind ▪ a politician who is lagging behind [=trailing] in the election campaign ▪ The company has lagged behind its competitors in developing new products. 2 [no obj] : to happen or develop more slowly than expected or wanted — usually + behind ▪ Production has continued to lag (far/well/way) behind schedule/demand.
b : to be in a position that is behind others — usually + behind ▪ a politician who is lagging behind [=trailing] in the election campaign ▪ The company has lagged behind its competitors in developing new products.
— compare 3lag
