Kawashi is literally "interaction" in Karate kawashi can be explained by the ability to read and understand your opponents actions.
In Kawashi practise, you pass through your opponents attack, in effect exchanging places. Unlike kumite, you do not catch the attack and sweep it away, nor do you stop back or to the inside. Instead you step in, towards the attacker, whilst turning (kawasu) your body to avoid the attack
In practise the distance between attacker and defender is about 90 centimetres, so that is the defender does not step in to avoid the attack they will surely be struck. ~This is therefore real practise in distancing (maai). It is a close quarter fighting drill, where you must quickly read your opponents intention to attack.
In a fight or battle interaction is implicit, however in kawashi practise there should be no clash or conflict, it means to pass by or cross through the opponent without any physical contct in tother words to interact.
Have you mastered kawashi????