trial balloon
Pronunciation:
/ˌtɹaɪəl bəˈluːn//ˌtɹaɪəl bəˈlun/noun
Definitions
A small balloon released into the sky to determine the direction and tendency of winds in the upper air before a manned ascent in a larger balloon; a ballon d'essai.
An idea, suggestion, or prospective action, product, etc., offered to an audience or group in order to test whether it generates acceptance or interest.
Synonyms:ballon d'essaifeeler