In literal, non-slang use, bitch is a term for female canines, particularly amongst dog breeders. It is also a common English vulgarism for a woman that typically carries denigrating or misogynistic overtones—such as resemblance to a dog. Its usage may be to characterize someone as having aggressive and spiteful bitterness, or else in being in possession of rudely intrusive or domineering tendencies. Its original use as a vulgarism, documented to the fourteenth century, suggested high sexual desire in a woman, comparable to a bitch in heat.
In recent usage, the range of meanings has expanded. In a feminist context, it can indicate a strong or assertive woman, one who might make men feel threatened. When applied to a man, "bitch" is a derogatory term for a subordinate.