Wiktionary
thumbs down
n. (alternative spelling of thumbs-down English)
Usage examples of "thumbs down".
She squatted low over the gun and was on the point of jamming her thumbs down on the firing button, when the bullet came up through the floor timbers.
They were required to put their thumbs down on an electronic touch pad, tethered to a powerful notebook computer whose superthin screen glowed eerily in the dark.
I held it in both hands and brought my thumbs down against the brittle shell.
I'd been ready to give her the thumbs down until I saw the way he looked at Catherine.