It comes from being fully engaged in whatever you're doing.

But the attention of those in charge was fully engaged.

The action very quickly became general, with the van and center of each line fully engaged.

He was fully engaged in the operation of the government.

As one who does a lot of sports events, I'm fully engaged.

He stared back, for the first time his mind fully engaged.

Each classroom is designed to fully engage students for learning.

But he was fully engaged and had no other choice than continue his assault.

As a 23-year-old, I find it difficult to fully engage myself in scientific debate.

Lead her to the humans; see that she is fully engaged with them.