بی گدار به آب زدن

Etymology
The idiomatic phrase translates literally to English: “to cross (lit. hit) a (body of) water (that is) without a ford.” Supposedly, before the Modern Era when most travellers had to travel through rivers without bridges, they had to find and pass through the shallow areas (fords) in order to avoid the risk of drowning. Thus, this idiom regurgitates the importance of preforming a task only after considering the possible dangers involved. Compare English idiomatic equivalents: “to throw caution to the wind”, “ to look before you leap.”

Verb

 * 1)  to perform an action before considering the risks associated
 * 2)  to make a decision before considering its aspects or facets

Usage notes
Often, the verb is conjugated in the negative imperative form: بی گدار به آب نزن/نزنید, the English equivalent of “don’t take the action without considering the risks”.