to veer off or deviate from an intended path, course, or set parameters

to accumulate or be piled into heaps due to the action of the wind or a current

to guide or lead livestock at a slow pace, typically to allow them to graze

cause to be carried by a current

the gradual departure from an intended course due to external influences (as a ship or plane)

a horizontal (or nearly horizontal) passageway in a mine

the pervading meaning or tenor

a general tendency to change (as of opinion)

a large mass of material that is heaped up by the wind or by water currents

a process of linguistic change over a period of time