cheek-by-jowl

/CH IY1 K B AY0 JH AW0 L/
adjective
  1. 1

    Tightly packed.

adverb
  1. 1

    In very close physical proximity, crowded together.

  2. 2

    (by extension) In very close or intimate association.

Source: https://en.wiktionary.org/wiki/cheek%20by%20jowl, https://en.wiktionary.org/wiki/cheek-by-jowl