To treat kindly/ show a smiling faceh
By metaphor: he smiled at him. He was kind to him (literally: he revealed to him the whiteness of his teeth within a smile).
("R. Yochanan: It is better for a milkman to give two to his friend than to give him milk to drink, as it is said: And for a white man two milks" - Ketuvot Kiya 12, 13)
Translation
Expression (Hebrew)
הִלְבִּין שִׁנַּיִם ל...
Definition (Hebrew)
בְּהַשְׁאָלָה: חִיֵּךְ אֵלָיו. הָיָה נֶחְמָד אֵלָיו (מִלּוּלִית: גִּלָּה לוֹ אֶת לֹבֶן שִׁנָּיו תּוֹךְ חִיּוּךְ).
("ר' יוֹחָנָן: טוֹב הַמַּלְבִּין שִׁנַּיִם לַחֲבֵרוֹ יוֹתֵר מִמַּשְׁקֵהוּ חָלָב, שֶׁנֶּאֱמַר: וְלָבָן שְׁנַיִם מַחְלֶבּ"- כְּתֻבּוֹת קִיא ע"ב, קסא)