Accelerandos

For extreme examples of the accelerandos and ritenutos which our metrical ear seems willing to accept easily, one might compare two ❋ Paull Franklin Baum (N/A)

Professor Marshall faced the piano again and precipitated himself headlong into the diabolic accelerandos of "The Hall of the Mountain-King." ❋ Dorothy Canfield Fisher (1918)

His aunt was vastly susceptible to music, and he would heap upon her (in the absence of any other) all those passionate reproaches for cruelty and faithlessness proper to the rôle -- welling crescendos and plaintive diminuendos and long, slow rallentandos, followed quickly by panting and impassioned accelerandos. ❋ Henry Blake Fuller (1893)

In diminuendos and accelerandos and ritenutos he was just as faithful. ❋ John F. Runciman (1891)

And Sally, after an intricate movement with a safety-pin, an openwork lace cuff that has lost a button, and a white wrist, goes down three accelerandos of stair-lengths, with landing pauses, and ends with a dining-room door staccato. ❋ William Frend De Morgan (1878)

Metron offers a high-precision engine and a bar based sequencer to provide detailed control over tempo settings and time signatures, including accelerandos and ritardandos as well as a tuner that can be calibrated to cent level. ❋ Unknown (2009)

Vignoles and Genz approach Wer hat dies Liedlein erdacht? in a similar way, and in their execution effect some fine accelerandos that accentuate the text and culminate in an exemplarily clear and even rendering of the vocal line that brings the piece to its conclusion. ❋ Unknown (2009)

That [old lady] was driving so slow I [shouted], "[accelerando mother fucker]," in the hopes she would speed up. ❋ Buzzkill7 (2017)