Join

v.kind, energeticeveryday

What it means

To connect with, participate in, or become part of a person, group, or activity.

Reach for it when inviting participation or describing connection without assuming permanent belonging

New residents are welcome to join the Saturday cleanup.

playful
come aboard
a warm informal invitation to a team fits
not when A legal membership process needs terms more precise than this nautical idiom.
everyday
connect
forming a link matters more than group membership
not when Connection can be technical or brief and need not involve shared activity.
warm
accompany
someone goes with another person for support or company
not when Accompanying does not make the person a member of the group.
professional
affiliate
an organization forms an official relationship while remaining distinct
not when Affiliation is institutional and does not describe casual participation.
professional
participate
taking part in an activity is the precise action
not when Temporary participation stops short of membership.
formal
enlist
formal commitment to a cause or service is intended
not when Enlist carries military associations and implies stronger obligation.
literary
unite
separate people or parts become one for a common purpose
not when Unite is stronger and can erase meaningful differences.

join a group
Anyone can join the group after reading its conduct agreement.
join forces
The two clinics will join forces without merging their patient records.
join the conversation
Residents can join the conversation online or at the library.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.