rubato

Rhythmic flexibility within a phrase or measure; a relaxation of strict time.

Containing or characterized by rubato.

In music, in modified or distorted rhythm: especially used of the arbitrary lengthening of certain notes in a measure and the corresponding shortening of others, for the purpose of bringing some tone or chord into decided prominence without altering the total duration of the measure.

Robbed; borrowed.

Borrowed time; — a term applied to a style of performance in which some tones are held longer than their legitimate time, while others are proportionally curtailed.

A tempo in which strict timing is relaxed, the music being played near, but not on the beat

a flexible tempo; not strictly on the beat