The paper claims that Turkish idioms attested in the Slavonic Linguistic Atlas (SLA) occur both in East Slavic and South Slavic dialects, however, with significant differences in the two groups. In the East Slavic part, they originate from Northern Turkish dialects (Tatarian, Chagatay, Chuvash, Kazakh, and others). Some of them are common throughout the whole territory and have even got incorporated into Standard Russian, while others are restricted mostly to Russian dialects. In South Slavic dialects, they originate from the Turkish Ottoman language and are usually found in Macedonian dialects, particularly in Aegean Macedonia. Historically, Turkish idioms tend to decrease in number but the lack of data from Bulgaria (stopped working on the Atlas) and from Bosnia and Herzegovina (recent war) makes an elaborate analysis of the process impossible.