tick
noun.
a metallic tapping sound
he counted the ticks of the clock
Synonym: ticking
noun.
any of two families of small parasitic arachnids with barbed proboscis; feed on blood of warm-blooded animals
noun.
a mark indicating that something has been noted or completed etc.
as he called the role he put a check mark by each student's name
Synonym: check, check mark
noun.
a light mattress
verb.
make a clicking or ticking sound
The clock ticked away
Synonym: click
verb.
make a sound like a clock or a timer
the clocks were ticking|the grandfather clock beat midnight
verb.
sew
tick a mattress
Synonym: retick
verb.
put a check mark on or near or next to
Please check each name on the list|tick off the items|mark off the units