tv. to spend some amount of money. : I can't lay that kind of money out every day!
tv. to explain a plan of action or a sequence of events. : Let me lay it out for you.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
lay (n.)
"short song," c.1240, from O.Fr. lai "song, lyric," of unknown origin, perhaps from Celt. (cf. Ir. laid "song, poem," Gael. laoidh "poem, verse, play") since the earliest verses so called were Arthurian ballads, but another theory traces it to a Gmc. source, cf. O.H.G. leich "play, melody, song."
[ley] 
