với

• (Hà Nội) IPA^(key): [vəːj˧˦]
• (Huế) IPA^(key): [vəːj˨˩˦]
• (Hồ Chí Minh City) IPA^(key): [vəːj˦˥] ~ [jəːj˦˥]

• Audio (Hồ Chí Minh City)

  (file)

với • (𢭲)

1. to reach (out for something)

• vói

với • (𢭲)

1. a stretch of the hand (một với)

Cognate with Muong Bi pỡi.

Probably related as etymology 1, as prepositions in Vietnamese are most often originally verbals.

The form vuối used to enjoy widespread usage in both Northern and Southern dialects, but is now completely obsolete. This form might be the diphthongized equivalent of vói (“to stretch out, to reach out”) mentioned above.

• (obsolete) vuối
• (Internet slang, text messaging) vs

với • (众, 喟, 某, 貝, 買, 𠇍)

1. with; together with; along with; and
   1. (arithmetic, after cộng (“to add”) or nhân (“to multiply”)) to or by

      cộng 2 với 3 ― to add 2 to 3

      nhân tổng với hiệu ― to multiply this sum by this difference

   2. (geometry, after kề (“adjacent”), bù (“supplementary”), song song (“parallel”), vuông góc (“perpendicular”), etc.) to

      góc ABC kề với góc CBD ― angle ABC is adjacent to angle CBD

      đường thẳng d song song/vuông góc với đường thẳng e/mặt phẳng p ― line d is parallel/perpendicular to line e/plane p

2. Short for đối với (“to”).

   (Đối) với tôi, vấn đề này chẳng có gì đáng lo ngại cả.

   To me, there's nothing to worry about this problem.

• đi (“(to subtract) from”)
• cho (“(to divide) by”)

với

1. Used to indicate an earnest request.
2. Used to express a blame, a reproach, or to stress a negation.