avoid compromising situations; don't do anything that could be misinterpreted
Proverb meaning one should avoid actions that might invite suspicion, even if innocent. Literally: 'In a melon field, don't put on your sandals' (lest someone think you're stealing melons).
As the proverb says, 'Don't put on your sandals in a melon field,' so you should avoid actions that might arouse suspicion.