This is just sport
The matter refers only to a sportive game and not to anything else. By extension: it refers to something that is not important.
(Modern Hebrew)
Translation
Expression (Hebrew)
זֶה רַק סְפּוֹרְט
Definition (Hebrew)
הַמְּדֻובָּר רַק בְּמִשְׂחָק סְפּוֹרְטִיבִי וְלֹא בְּמַשֶּׁהוּ שׁוּב. בְּהַשְׁאָלָה: הַמְּדֻבָּר בְּמַשֶּׁהוּ שֶׁאֵינוֹ חָשׁוּב.
(הָעִבְרִית הַחֲדָשָׁה)