godan verb (-mu), transitive verb
drop into drop by drop; drip into
Describes slowly adding a liquid or fine substance into a container or mixture, emphasizing the gradual, drop-by-drop action.
ソースに醤油を少しずつ垂らし込む。
I drip soy sauce little by little into the sauce.
試験管に試薬を垂らし込んで反
I drop the reagent into the test tube and observe the reaction.