noun
house search; police raid
Police slang for searching a premises; derived from reversing さがす (to search). Often used in the compound ガサ入れ.
See also: ガサ入れ
警察が容疑者の家にガサを入れた。
The police conducted a search of the suspect's house.
ガサ入れの準備をしている。
They are preparing for the raid.