(v. i.) To plunge into water head foremost; to thrust the body
under, or deeply into, water or other fluid.
(v. i.) Fig.: To plunge or to go deeply into any subject,
question, business, etc.; to penetrate; to explore.
(v. t.) To plunge (a person or thing) into water; to dip; to duck.
(v. t.) To explore by diving; to plunge into.
(n.) A plunge headforemost into water, the act of one who dives,
literally or figuratively.
(n.) A place of low resort.
