dip the brush into the paint.
dip the garment into the cleaning solution.
He immersed himself into his studies.
He launched into a long diatribe.
Immerse yourself in hot water.
It plunged to the bottom of the well.
She plunged at it eagerly.
She plunged into a dangerous adventure.
The professor plunged his students into the study of the Italian text.
the stock market plunged.