tick

a metallic tapping sound; "he counted the ticks of the clock"

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

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"

a light mattress

make a clicking or ticking sound; "The clock ticked away"

make a sound like a clock or a timer; "the clocks were ticking"; "the grandfather clock beat midnight"

sew; "tick a mattress"

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"