feeler
/ˈfi:lə(r); `filə/ n
1 long slender part in certain animals, esp insects, for testing things by touch 某些动物（尤指昆虫）的触须, 触角.
2 (idm 习语) put out feelers (infml 口) cautiously check the views of others 谨慎地试探别人的观点
I'll try to put out some feelers to gauge people's reactions to our proposal. 我想试探一下, 看看人们对我们建议的反应.