They allied/ banded together against him
They banded together into a single group against him. His companion is his adversary.
("My rabbi said: When I went to study Torah with Rabbi Eleazar ben Shamua, his disciples flocked to me like the roosters of the house of the learned, and they did not allow me to learn but one word of our mishna" - Yivamot Fed a.a., and so: "A deed in the hymn of the old man who stood on the altar with Ezra and his disciples flocked to him, the disciples of Shammai (Shamai) are among them. "Come and see that she is a female and I have required her to make peace offerings. The tribe has spoken in words and they went there from the hand of a woman, the hand of the house of Shammai" - Tosefta Masekhet Hagiga (Lieberman) Chapter 2, 11)
Translation
Expression (Hebrew)
חָבְרוּ עָלָיו
Definition (Hebrew)
הִתְאַגְּדוּ לַחֲבוּרָה אַחַת כְּנֶגְדּוֹ. חֲבֵרוֹ כְּנֶגְדּוֹ.
("אָמַר רַבִּי: כְּשֶׁהָלַכְתִּי לִלְמוֹד תּוֹרָה אֵצֶל ר' אֶלְעָזָר בֶּן שָׁמוֹעַ, חָבְרוּ עָלַי תַּלְמִידָיו כְּתַרְנְגוֹלִים שֶׁל בֵּית בּוּקְיָא, וְלֹא הִנִּיחוּנִי לִלְמֹד אֶלָּא דָּבָר אֶחָד בְּמִשְׁנָתֵנוּ"- יְבָמוֹת פֵּד ע"א, וְכֵן:"מַעֲשֶׂה בְּהִלֵּל הַזָּקֵן שֶׁסָּמַךְ עַל הָעוֹלֶה בְּעֶזְרָה וַחֲבֵרוֹ עָלָיו תַּלְמִידֵי שָׁמַי (שַׁמַּאי) אֶמ' לָהֶם בּוֹאוּ וּרְאוּ שֶׁהִיא נְקֵבָה וְצָרִיךְ אֲנִי לַעֲשׂוֹתָהּ זִבְחֵי שְׁלֵמִים הֶפְלֵגָן בִּדְבָרִים וְהָלְכוּ לָהֶן מִיָּד גָּבְרָה יָדָן שֶׁל בֵּית שָׁמַי"-תּוֹסֶפְתָּא מַסֶּכֶת חֲגִיגָה (לִיבֶּרְמָן) פֶּרֶק ב, יָא)