second fiddle

fiddle while Rome burns

To neglect helping when one’s time is needed most; to ignore the major problem at hand (whilst doing something less important); to be idle, inactive, or uninterested in a time of great need.

hang up one's fiddle

Synonym of hang up one's boots.

have second thoughts

To change one's opinion, or be uneasy about a previous decision.

just a second

A short period of time, typically anywhere from a few seconds to several minutes or more.

play first fiddle

To play a leading role.

play second fiddle

To play a subsidiary or subordinate role to someone or something else.

play someone like a fiddle

To play (manipulate) (a person) skillfully.

second banana

A comedian who plays a secondary or supporting role, especially as straight man and traditionally in vaudeville or burlesque theatre.