English to Portuguese Social Sciences Poetry & Literature provérbios

From here: We don't want to feel sucker punched by vulnerability.

Def:
A sucker punch (American English) (also known as a coward punch, one-punch attack or king hit (Australian English); or cold-cock (American English)) is a punch made without warning or while the recipient is distracted, allowing no time for preparation or defense on the part of the recipient. It is often thrown from behind—such as in the 'knockout game'—although striking from behind is not a prerequisite for a sucker punch. The term is generally used in situations where the way in which the punch has been delivered is considered unfair or unethical, and is done using deception or distraction, hence the term 'sucker' used to refer to the victim.
In boxing, a sucker punch—as is done when 'hitting on the break', for example—is illegal. For example, when James Butler knocked Richard Grant unconscious after losing a fight to him on points, his license was suspended.[1