tyká
Tyka, in Czech and Slovak, refers to the practice of addressing someone informally using the second-person pronoun ty. The related noun, tykání, denotes this form of address, while the formal alternative is vykání, which uses the pronoun vy and corresponding verb forms. The choice between tykání and vykání is a social convention that signals levels of familiarity, formality, and distance.
Usage and etiquette: Tykání is common among peers, colleagues of equal status, family members, friends, and others
Linguistic aspects: The verb tykat denotes the act of using informal address. It is conjugated regularly in
Regional and contemporary notes: Both Czech and Slovak languages retain tykání as a widespread sociolinguistic feature.