To start participating in an activity that is already happening.
To do something together with other people who are already doing it.
2 meanings, ordered from most common to least. Color-coded by CEFR level.
To become part of an activity or event that others are already doing.
"The children started singing, and soon all the parents joined in."
Won't you join in?
— Common phrasing in countless English classroom songs and children's media, e.g. traditional rounds and group songs
To contribute to a shared effort or discussion.
"Please feel free to join in the conversation at any point."
Very common and natural in everyday speech. Can be used absolutely ('everyone joined in') or with 'with' ('joined in with the singing'). Conveys enthusiasm or inclusiveness. Suitable for all ages and contexts.
Natural word combinations native speakers use most often.
The five tense forms you'll use most often.
Listen to native speakers using "join in" in real YouTube videos — click a clip to watch it on Looplines.
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