突然
とつぜん · totsuzen · JLPT N3 · na-adj
suddenly
🐕 突 = dog (犬) dashing out of a hole (穴) + 然 = in that manner → suddenly
突 is built from 穴 (hole) over 犬 (dog), an old character for a dog darting out without warning. 然 is an adverb ending, as in 自然 (shizen, naturally). Together they mean happening without warning: suddenly.