Wiktionary
ticking off
vb. (present participle of tick off English)
Usage examples of "ticking off".
The miles were ticking off, one after the other, the highway almost deserted.
She was ticking off all this like an executive secretary, but at his headshake she stopped and grinned.
Park, the night manager, had explained this to Rydell, ticking off points on his notebook.
But was part of one brain moving within the privacy of some secret orbit, ticking off its hidden calculus like the stealthy mechanism of an infernal machine?