In the biomedical sciences, to introduce slowly, through a winding or narrow passage, or by a persistent movement. The term "insinuate" in this sense carries the connotation of introducing artfully and gently, as a cardiologist would do in insinuating a catheter (a tube) into the arteries of ones heart. The origin of "insinuate" [..]

suggest in an indirect or covert way; give to understand "Good heavens, do you mean to insinuate that I did anything crooked?" said Bojo loudly, yet at the bottom ill at ease. — Johnson, Owe [..]

1520s, "to covertly and subtly introduce into the mind or heart" (trans.), from Latin insinuatus, past participle of insinuare "to thrust in, push in, make a way; creep in, intrude, bri [..]

v. To imply.

(v) introduce or insert (oneself) in a subtle manner(v) give to understand

(rare) To creep, wind, or flow into; to enter gently, slowly, or imperceptibly, as into crevices. * Woodward *: The water easily insinuates itself into, and placidly distends, the vessels of veget [..]