I feel very much on the qui-vive, as I haven't seen that particular part before.
The people were on the qui-vive and I often had to give up my investigation without marked results.
She stands four mortal hours at the entrance of the drawing-room, all the while on the qui-vive.
At the same instant something moved in the fields to the left, and a shrill voice called: "qui-vive?"
Paris would not be Paris if it did not keep us on the qui-vive.
He remembered the general character of the river from his former descent, but he had to be on the qui-vive as to details.
It is common, however, for the more famed war chiefs to keep their personal enemies on the qui-vive, by periodic threats.
1726, in on the qui vive "on the alert," from French qui voulez-vous qui vive? sentinel's challenge, "whom do you wish to live," literally "(long) live who?" In other words, "whose side are you on?" (The answer might be Vive la France, Vive le roi, etc.).