I just started a new job recently. Whenever my boss asks me to join in on a conversation I feel valued.
To join in means to become a part of or participate. It is an inseparable verb.
Let’s see some examples.
My sister is very shy but the neighbors always ask her to join in the fun when they are playing in the park.
Everyone went to a party yesterday but John could not join in because he had to work late.
Make sure you are doing all of your English work so you can join in the fun your friends have!