Meaning of tick
Definition of tick
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"
make a sound like a clock or a timer; "the clocks were ticking"; "the grandfather clock beat midnight"
sew; "tick a mattress"