An onomatopoeic adverb expressing being moved to tears or having one's heart gently stirred (similar to 'horori').
その手紙を読んで、私はほろっと涙が出た。
Reading that letter, I felt a tear well up.
お年寄りの優しさにほろっとした場面が何度もあった。
There were several moments when I was gently moved by the kindness of the elderly.
映画のラストで観客からほろっとした笑いとため息が出た。
At the movie's finale, the audience reacted with bittersweet smiles and soft sighs.