In various immaterial applications. Of time, one's life, etc.: To pass gently and imperceptibly. Also with along, away, †forth, on, etc.

Of time: To go by quickly or imperceptibly; to pass unmarked; to run. Chiefly with adverbs, as along, away, by.

Of things. Of time (with on, away): to come or go unobserved.

Of time: To slip away. rare.