sting (v.)

Old English stingan "to stab, pierce, or prick with a point" (of weapons, insects, plants, etc.), from Proto-Germanic *stingan (source also of Old Norse stinga, Old High German stungen "to prick," Gothic us-stagg "to prick out," Old High German stanga, German stange "pole, perch," German stengel "stalk, stem"), perhaps from PIE *stengh-, nasalized form of root *stegh- "to stick, prick, sting."

Specialized to insects late 15c. Intransitive sense "be sharply painful" is from 1848. Slang meaning "to cheat, swindle" is from 1812. Old English past tense stang, past participle stungen; the past tense later leveled to stung.

sting (n.)

Old English stincg, steng "act of stinging, puncture, thrust," from the root of sting (v.). Meaning "sharp-pointed organ capable of inflicting a painful puncture wound" is from late 14c. Meaning "carefully planned theft or robbery" is attested from 1930; sense of "police undercover entrapment" first attested 1975.

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Definitions of sting from WordNet
sting (v.)
cause a sharp or stinging pain or discomfort;
Synonyms: bite / burn
sting (v.)
deliver a sting to;
A bee stung my arm yesterday
Synonyms: bite / prick
sting (v.)
saddle with something disagreeable or disadvantageous;
I was stung with a huge tax bill
Synonyms: stick
sting (v.)
cause a stinging pain;
Synonyms: prick / twinge
sting (v.)
cause an emotional pain, as if by stinging;
His remark stung her
sting (n.)
a kind of pain; something as sudden and painful as being stung;
the sting of death
he felt the stinging of nettles
Synonyms: stinging
sting (n.)
a mental pain or distress;
Synonyms: pang
sting (n.)
a painful wound caused by the thrust of an insect's stinger into skin;
Synonyms: bite / insect bite
sting (n.)
a swindle in which you cheat at gambling or persuade a person to buy worthless property;
Synonyms: bunco / bunco game / bunko / bunko game / con / confidence trick / confidence game / con game / hustle / flimflam
sting (n.)
operation designed to catch a person committing a criminal act;
the police conducted a sting operation
Synonyms: sting operation