get your fingers burnt

get (one's) fingers burned

To suffer an unpleasant or ruinous consequence (especially the loss of money) for some action, often such that one becomes unwilling or reluctant to do it again. During the boom times, countless would-be investors put everything they owned in shady investment deals, and most of them ended up getting their fingers badly burned.
See also: burn, finger, get

get your ˈfingers burnt

,

burn your ˈfingers

suffer as a result of doing something without realizing the possible bad results, especially in business: She got her fingers burnt when she set up a business and had all her money stolen by her partner.
See also: burnt, finger, get