Shamar Oto Al Esh Ketannah - שָׁמַר אוֹתוֹ עַל אֵשׁ קְטַנָּה
Pronunciation: Sha·mar o·to al esh ke·tan·nah
Literal translation: Keep him on the small fire, (slang) to put something/someone on the back burner
This a great idiom to learn today on the holiday of Lag Ba'omer, a holiday that features bonfires.
So what this idiom means you are making a person, task, or event a low priority. In other words, you've decided to put the task or activity on the back burner and it isn't immediately important.