Noun and する verb
とうけつ
彼女は道路の凍結についてよく文句を言っています。
She often complains about frozen roads.
When things are frozen they get tied up in ice, causing a freeze.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.