lay (someone or something) alongside (someone or something)
To place someone or something in a flat, resting position next to someone or something else. We laid the wounded soldier alongside his companion while we looked for a doctor. You can lay that log alongside the others.
lie alongside (someone or something)
To rest or recline horizontally next to someone or something. There wasn't anywhere else for me to sleep, so I had to lie alongside my friend in the spare bed. I just lay alongside my poor old dog stroking his face as the vet put him to sleep.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
lay something alongside (of something)
to place something next to something else, lengthwise. (Of is usually retained before pronouns.) Please lay the spoon alongside the knife. Find the knife and lay the spoon alongside.
lay alongside something
[for a ship] to rest afloat next to something. The ship lay alongside a lovely island while a shore party searched for fresh water. Our ship lay alongside the narrow wooden pier.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.