più mosso

A little faster Poco piu mosso. . . . A little faster. Poco meno . . . . . . A little slower.

Più mosso – more movement; faster. Mosso – movement, more lively; quicker, much like più mosso, but not as extreme. Precipitando – hurrying; going faster/forward. Rallentando – a gradual slowing down (abbreviation: rall.)

Piu mosso and meno mosso change the current tempo. They mean "more movement" and "less movement", but in a sense of faster/slower. You can think of it as increasing/reducing the tempo by a couple of bpms at the point of the marking instead of a gradual change like accelerando or ritardando.

più / (pjuː) / adverb. music (in combination) more (quickly, softly, etc): più allegro; più mosso; più lento.

più p, standing for più piano and meaning "quieter". più f, standing for più forte and meaning "louder".

sostenuto in American English 1. played at a slower but sustained tempo, with each note held for its full value. often used as a musical direction.

In music terms, "poco meno mosso" means a little less motion. In other words, it refers to slowing things down with a slower tempo and diminished motion. "Poco meno mosso" is an Italian phrase which translates as "less quickly." The opposite in Italian is "poco piu mosso," which means faster.

Meno mosso - less movement; slower. Meno moto - less motion. Piu mosso - more movement; faster. Mosso - movement, more lively; quicker, much like piu mosso, but not as extreme.

PIU means the project implementation unit established in the Project Implementing Entity pursuant to the provisions of Section I.A.

piu in British English adverb. more (quickly, softly, etc)

fast [Italian, more allegro (fast)] A directive to perform the indicated passage of a composition more allegro, or faster. See more about tempo terminology in the Appendix.

So Brahms seems to use the term Andante in its modern sense simply as a tempo between Allegretto and Adagio, rather than the more literal one of "moving", and piu Andante just means a return to a Andante tempo or a slowish Andante.