The bachelor thesis deals with the issue of prefixes of the Russian verb platiƄ in comparative Russian-Czech aspect. The thesis is divided into two main parts, the theoretical part and the practical one. The theoretical part deals with basic terms related to word formation and various ways of creating new words. An integral and most important part of the thesis is the definition of semantics. The theoretical part explains the meaning of the Russian verbal prefixing, the issue of the ambiguity of Russian verbs and the basic meanings of prefixes in prefixed verbs. The practical part is devoted to detailed analysis of selected pairs of prefixed verbs and comparison of all their found meanings. Two Russian and two Czech dictionaries helped us with this detailed analysis. We used verbs in context to understand the found meanings. The National Corpus of the Russian Language and the Czech National Corpus served for this purpose.