To thrust into liquid, or into any penetrable substance; to immerse.
to plunge the body into water
To cast, stab or throw into some thing, state, condition or action.
to plunge a dagger into the breast; to plunge a nation into war
To baptize by immersion.
To dive, leap or rush (into water or some liquid); to submerge oneself.
he plunged into the river
To fall or rush headlong into some thing, action, state or condition.
to plunge into debt; to plunge into controversy
To pitch or throw oneself headlong or violently forward, as a horse does.
To bet heavily and recklessly; to risk large sums in gambling.
To entangle or embarrass (mostly used in past participle).
To overwhelm, overpower.