verb

(of an event regarded as threatening or significant) be about to happen.

it seemed certain that some great trial of strength impended between the opponents

imminent,at hand,close,close at hand,near,nearing,approaching,coming,forthcoming,upcoming,to come,on the way,about to happen,upon us,in store,in the offing,in the pipeline,on the horizon,in the air,in the wind,brewing,looming,looming large,threatening,menacing,on the cards