mark (someone's) words

Translations
помнить (чьи-то) слова
Mark my words, he will regret this decision.
Помни мои слова, он пожалеет об этом решении.
Definitions
To pay close attention to what someone has said, often implying that the statement will be important or significant in the future.
Words
word

noun
слово
mark

verb
отмечать