a change in behavior or state—usually undesired such as a temporary failure
The exact meaning of this sense of lapse is often subject to its context:
basic example that simply indicates an undesired change in behavior — "lapsed into alcoholism"
example indicating that the change was short-term and due to a failure (often of effort or diligence) — "a lapse in judgment"
example indicating return to a previous undesired behavior or state — "lapsed into her old bad habits"
examples indicating a change in what was occurring where the change is not necessarily negative — "There was a lapse in the conversation," or "She stopped talking as she lapsed into her own internal world."
With new respect she moved to pass him the wooden bowl of popcorn, and to it she added a smile that caused him to lapse again into scarlet-faced silence.
lapse = change in behavior or state
There are no more uses of "lapse" in The Witch of Blackbird Pond.