tick

A metallic tapping sound.

“he counted the ticks of the clock”

A mark indicating that something has been noted or completed etc.

A light mattress.

Any of two families of small parasitic arachnids with barbed proboscis; feed on blood of warm-blooded animals.

Make a sound like a clock or a timer.

“the clocks were ticking”

Sew.

“tick a mattress”

Make a clicking or ticking sound.

“The clock ticked away”

Put a check mark on or near or next to.

“tick off the items”