C1[Tusually+ adv/prep]to put something in especially a flat or horizontal position, usually carefully or for a particular purpose: She laid the baby on the bed.He laid the tray down on the table.She laid aside her book and went to answer the phone.We're having a new carpet laid in the hall next week.The plan is to lay (= build) the foundations for the new apartments in October.Placing and positioning an object›[T]to prepare a plan or a method of doing something: Even the best laid plans go wrong sometimes.PreparingPlanning, expecting and arrangingPlotting and trapping