put your shirt on

put (one's) shirt on (something)

1. To bet or risk everything one has on something. Tech companies seem to be putting their shirts on virtual reality being the future of the industry. Anyone with a gambling addiction knows the feeling of putting your shirt on a hand of cards, feeling sure it will pay off big time, only to lose everything.
2. By extension, to be absolutely certain that something will happen. I would hope that the industry is moving towards a more customer-friendly position, but I wouldn't put my shirt on it.
See also: on, put, shirt

put your shirt on

bet all you have on; be sure of. British informal
See also: on, put, shirt
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