straw poll

Từ điển Oxford Advanced Learner 8th

ˌstraw ˈpoll [straw poll] BrE NAmE (NAmE also ˌstraw ˈvote) noun
an occasion when a number of people are asked in an informal way to give their opinion about sth or to say how they are likely to vote in an election

Example Bank:
•I took a quick straw poll among my colleagues to see how many agreed.
•It's only a straw poll, but it suggests that most people are in favour of stricter regulations.