be on the low sidebe on the makebe on the mendbe on the pissbe on the point ofbe on the point of doing somethingbe on the razor's edgebe on the receiving endbe on the safe sidebe on the same pagebe on the same wavelengthbe on the scenebe on the search ofbe on the spotbe on the staff of somewherebe on the stagebe on the takebe on the threshold of sthbe on the tip of one's tonguebe on the toesbe on the trail of somebody somethingbe on the verge ofbe on the wagonbe on the war pathbe on the waybe on thin icebe on thin ice with somebodybe on tobe on to itbe on to someonebe on to somethingbe on to sthbe on topbe on top of one's gamebe on top of sthbe on trackbe on trendbe on velvetbe on very thin icebe on watchbe on your best behaviourbe on your feetbe on your headbe on your ownbe on your toesbe onebe one and the samebe one for somethingbe one in a millionbe one sandwich short of a picnic