push

at a push if necessary; in an emergency. British

2011Hair Today No more than two of us can comfortably fit in there at a time-three at a push if you don't mind being intimately subjected to the specific perfume he/she may be wearing.

give someone (or get) the push (or shove) dismiss someone (or be dismissed) from a job; reject someone (or be rejected) in a relationship. British informal

push at (or against) an open door have no difficulty in accomplishing a task; fail to realize how easy something is.

push the boat out: seeboat.

push someone's buttons: seebutton.

push the envelope: seeenvelope.

push your luck act rashly or presumptuously on the assumption that you will continue to be successful or in favour. informal

too posh to push: seeposh.

when (or if) push comes to shove when action must be taken; if the worst comes to the worst. informal

2001Financial Director When push comes to shove, investors are not always impressed with promises of jam tomorrow.