2sus·pect 
/ˈsʌˌspɛkt/ noun
plural sus·pects /ˈsʌˌspɛkt/ noun [count] 1 : a person who is believed to be possibly guilty of committing a crime
▪ a murder suspect ▪ One suspect has been arrested. ▪ She is a possible/prime suspect in connection with the kidnapping. 2 : a thing that is thought of as a possible cause of something bad
▪ The prime suspect for the food poisoning is the potato salad.
▪ a murder suspect ▪ One suspect has been arrested. ▪ She is a possible/prime suspect in connection with the kidnapping.
▪ The prime suspect for the food poisoning is the potato salad.
the usual suspects
: the usual people or things that are suspected or thought of in a particular situation — often used humorously ▪ The breakfast menu had all the usual suspects [=the usual things]—eggs, pancakes, waffles, and French toast.
