NAMEsuspend - Suspend the execution of this shell until it receives a SIGCONT signal
Suspend the execution of this shell until it receives a SIGCONT signal. A login shell cannot be suspended; the -f option can be used to override this and force the suspension. The return status is 0 unless the shell is a login shell and -f is not supplied, or if job control is not enabled.
This is extracted from the main bash man page, see there for more details.