Transgress - Rather, as in marg. If the “yoke” and “bands” refer to the slavery in Egypt from which Yahweh freed Israel, the sense is - “For of old time I Yahweh broke thy yoke, I burst thy bands,” not that thou mightest be free to do thy own will, but that thou mightest serve me: “and thou saidst, I will not serve.”
When ... - “For ... under every leafy tree thou” layest thyself down as a harlot. The verb indicates the eagerness with which she prostrates herself before the objects of her idolatrous worship.