żona

1. wife (married woman)
2. (obsolete) woman (adult female human)

powinna

third-person singular feminine present of powinien

wiedzieć

1. to know (to perceive the truth or factuality of; to be certain of or that)
2. to know (to be aware of; to be cognizant of)
3. to know (to have knowledge; to have information, be informed)
4. to know (to understand or have a grasp of through experience or study)

że

• Conj

  introduces a subordinate clause; that

• Particle

wieczór

• Noun

  1. evening (time of day before night)
  2. evening (party or gathering held in the evening)

• Adv

się

• Pron

  1. reflexive pronoun; oneself, self
  2. each other, one another
  3. one's own home

• Particle

nie

• Particle

  negation particle; no, not

• Verb
• Pron