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Related to diddler: fiddler
tr.v. did·dled, did·dling, did·dles
Slang To cheat; swindle: "The Swiss have special laws for people who diddle hotels" (John le Carré).
[Perhaps akin to Old English dydrian, to deceive, or from variant of dialectal doodle, fool, simpleton; akin to Low German dudeldopp.]
v. did·dled, did·dling, did·dles
1. To jerk up and down or back and forth.
2. Vulgar Slang
a. To have intercourse with (a woman).
b. To practice masturbation upon.
1. To shake rapidly; jiggle.
2. Slang To play experimentally; toy: The children diddled with the knobs on the television all afternoon.
3. Slang To waste time: diddled around all morning.
[Probably alteration of dialectal didder, to quiver, tremble, from Middle English dideren, variant of daderen, doderen; see dodder1.]