French

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French scale (F),

a scale for grading sizes of sounds, tubes, and catheters as based on a diameter of 0.33 mm equaling 1 F on the scale (for example, 3 F = 1 mm); grading to scale is carried out using a metal plate with holes ranging from 0.33 mm to 1 cm in diameter.
Synonym(s): Charrière scale

French

adjective (slang) Referring to oral sex.

verb (slang)
(1) To perform oral sex on someone.
(2) To give an open-mouth (i.e., “French”) kiss.
References in periodicals archive ?
It had no plates and no front grill--looked like a proverbial piece of sh*t, pardon my French. I passed the hand mike to my gunner, crossed the median, and signaled the vehicle to stop.
This mischievous play on the F word (pardon my French indeed) resulted in much pursing of lips among the blue rinses and instant brand recognition among the clothing chain's target market, who delighted at the double takes as people peered at their T-shirt fronts to see if the logo really said what they thought it did.
Tout comprendre c'est tout pardoner; pardon my French!
Pardon my French, but I couldn't help thinking of that famous quote - supposedly said about the Charge of the Light Brigade - when reflecting on Wales' demolition of Azerbaijan at the weekend.