This is the 5144th most frequent Japanese word.
通じる
To be understood, to communicate, or to be connected.
In this sentence, "通じる" is used to indicate someone's ability or skill to communicate effectively in the language mentioned, which is English in this case.
彼は英語がよく通じる。
He speaks English fluently.
Here, "通じる" expresses the idea of mutual understanding or sharing of emotions.
気持ちが通じたと信じています。
I believe our feelings have been understood.
In this instance, "通じる" denotes a physical connection or route leading to a specific place.