(informal, idiomatic) To dwell on a single subject with disagreeable or wearisome persistence.

(idiomatic) To turn against a previous affiliation or allegiance. / Used other than figuratively or idiomatically: see turn, coat.

To cease laughing or smiling, etc., and compose one's features.

To force to the last expedient, or to the utmost exertion.

(US, slang) To abscond while at liberty under bail bonds.

simple past tense and past participle of rain on one's parade

present participle of rain on one's parade

Third-person singular simple present indicative form of rain on one's parade

To lie (tell a falsehood) flatly or abominably.

To retain one's skill through regular practice.