slip through the cracks

fall between the cracks

To wind up in an unexpected situation which is, inadvertently, invisible to or not handled by whatever process one had hoped to be subject to; to be overlooked.

fall through the cracks

To be missed; to escape the necessary notice or attention.

give someone the slip

To evade, escape, or get away from somebody.

let slip

To divulge a secret, as by accident or mistake.

let something slip

To accidentally reveal a secret.

pink slip

A notice of termination of employment.

slip back to old ways

to return to past bad habits

slip into

To put on some clothes rapidly.