both, together, alike
倶 centers on togetherness and similarity: two or more things being together, alike, or both involved in the same situation.
倶 is a variant form of 俱, combining the person radical 亻 with 具, which likely contributes both sound and the idea of being together or alike.
A person 亻 beside 具 (tool/ingredient) suggests people gathering together with shared tools or ingredients, emphasizing togetherness and similarity.
For グ, imagine two people together saying 'Good!' in unison: Good -> グ, and they are both alike in their approval.
club; fraternity; sorority; clubhouse
fan club
country club
cannot allow (oneself) to live (with someone) under the canopy of heaven; cannot allow (the sworn enemy) to live in this world; irreconcilable (enemy)
golf club (used to hit the ball)
jazz club
journal club (gathering to discuss recent papers or articles from academic journals)
gym; gymnasium
dance club
tennis club
dating club; club providing a paid dating service to its members
yacht club; yachting club
mortal enemy; sworn enemy; nemesis
Asian koel (Eudynamys scolopacea)
Kulika; manifestation of Acala in the form of a flame-wreathed dragon wrapped around and swallowing the tip of an upright sword
Dragon King Kulika; manifestation of Acala in the form of a flame-wreathed dragon wrapped around and swallowing the tip of an upright sword
tattoo (esp. one of a flame-wreathed dragon wrapped around and swallowing the tip of an upright sword); person with a tattoo
concurrence
Buddhist sect originating in the seventh century
Kusha Sect