Standing on end: specifically said of the hind toe of a bird when its base is inserted so high on the shank that only its tip touches the ground: correlated with incumbent
Someone who is insistent keeps insisting that a particular thing should be done or is the case. Stalin was insistent that the war would be won and lost in the machine shops + insistently in·sist·ent·ly `What is it?' his wife asked again, gently but insistently
An insistent noise or rhythm keeps going on for a long time and holds your attention. the insistent rhythms of the Caribbean and Latin America. = unrelenting
demanding attention; "clamant needs"; "a crying need"; "regarded literary questions as exigent and momentous"- H L Mencken; "insistent hunger"; "an instant need"