あてこと

あてこと, あてごと【当て事】

expectations; hope(s). [＝あて 2]

●当てごとははずれやすい. One's hopes are often disappointed [unfulfilled]. | There is many a slip 'twixt cup and lip. 【諺】

・当てごともないほらを吹くな. Stop your empty bragging!