WordNet sense 1 (a metallic tapping sound):

ticking

WordNet sense 2 (a mark indicating that something has been noted or completed etc.):

check, check mark

WordNet sense 3 (make a clicking or ticking sound):

click

WordNet sense 4 (make a sound like a clock or a timer):

beat, ticktock, ticktack

WordNet sense 5 (sew):

retick

WordNet sense 6 (put a check mark on or near or next to):

mark, mark off, tick off