ほっと
ほっと · hotto · JLPT N3 · adverb
feel relieved
☕ Sounds like hot-to(o): the warm sigh after a sip of hot tea, stress over
ほっと is a mimetic word for a long breath out of relief. It is usually used with する: ほっとした means I was relieved. Don't mix it up with ホット (hot), which is a loanword written in katakana.