Shirabe

ほくそ笑むほくそえむ

Godan Intransitive
English jmdict
1
Godan verb with 'mu' endingintransitive verb to chuckle to oneself;to gloat (over)
Other forms 北叟笑む 【ほくそえむ】 (ateji (phonetic) reading) (rarely used kanji form)