It is not customary...in this way
It is not customary or accepted to do...in this manner or in this matter.
("But one who makes a hole in a chicken coop, for it is not the way of building [to do so]" - Shabbat 102b)
Translation
Expression (Hebrew)
אֵין דֶּרֶךְ...בְּכָךְ
Definition (Hebrew)
אֵין נָהוּג אוֹ מְקֻבָּל לַעֲשׂוֹת...בְּצוּרָה זוֹ.
("אֲבָל עוֹשֶׂה נֶקֶב בְּלוּל שֶׁל תַּרְנְגוֹלִים דְּאֵין דֶּרֶךְ בִּנְיָן בְּכָךְ"- שַׁבָּת קַב ע"ב)