At one stroke / At the same time
Figuratively: all at once.
("If one has relations with his sister, his father's sister, and his mother's sister at one stroke, what is the law—one liability for all, or one for each? They said to me: We did not hear (a ruling), but we have heard: if one has relations with his five menstruating wives at the same time, he is liable for each and every one."—Kritot 3:7. Similarly: "If one performed all the primary labors of Shabbat at one stroke, he is liable for each and every one."—Tosefta Shabbat (Lieberman), Chapter 8)
Translation
Expression (Hebrew)
בְּהֵעָלֵם אֶחָד
Definition (Hebrew)
בִּמְלִיצָה: בְּבַת אַחַת.
("הַבָּא עַל אֲחוֹתוֹ וְעַל אֲחוֹת אָבִיו וְעַל אֲחוֹת אִמּוֹ בְּהֶעְלֵם אֶחָד מַהוּ, חַיָּב אַחַת, עַל כֻּלָּן, אוֹ אַחַת עַל כָּל אַחַת וְאַחַת? וְאָמְרוּ לִי לֹא שָׁמַעְנוּ, אֲבָל שָׁמַעְנוּ: הַבָּא עַל חָמֵשׁ נָשָׁיו נִדוֹת בְּהֶעְלֵם אֶחָד שֶׁהוּא חַיָּב עַל כָּל אַחַת וְאַחַת"- כְּרִיתוּת ג ז, וְכֵן:"כָּל אֲבוֹת מְלָאכוֹת שֶׁבַּתּוֹרָה עֲשָׂאָן כֻּלָּן בְּהֶעְלֵם אֶחָד חַיָּב עַל כָּל אַחַת וְאַחַת"- תּוֹסֶפְתָּא מַסֶּכֶת שַׁבָּת (ליברמן) פֶּרֶק ח)