(For levers and lever-like switches that you "lay" from one side to the other. Not very common in daily life.)
2.
to divide among, to split, to pass on to
("umlegen auf+Acc" - pretty much only used in the context of dividing costs between parties. Think an apartment building and the costs for the hallway lights.)
3.
to kill
(A very colloquial term for killing, mainly with a gun. You'll hear it in action movies a lot.)
4.
to put on, to put around
(For some items that you literally "lay" around somewhere. Like a scarf for example. A bit more high register sounding than "ummachen".)