虱潰 しらみつぶ
shiramitsubushi

Noun

1. very thorough search (for contraband, escaped convict, etc.); fine-tooth-comb search; exhaustive search; scouring

Usually Written in Kana
救援 きゅうえん たい子供 こどもをしらみつぶしに さがした。
kyūentaiwa kodomō shiramitsubushini sagashita.
The rescue worker searched the area, looking for the child.
Other forms: