not have a leg to stand on

Translations
не иметь никаких доказательств
Without any witnesses, you don't have a leg to stand on in court.
Без свидетелей у тебя нет никаких доказательств в суде.
Definitions
To be in a situation where you cannot prove or support your argument, claim, or position because you lack evidence or justification.
Words
leg

noun
нога
stand

verb
стоять
have

verb
иметь
stand on

verb
стоять на