work oneself up into a lather
work oneself (up) into a lather
1. tv. to work very hard and sweat very much. (In the way that a horse works up a lather.) Don’t work yourself up into a lather. We don’t need to finish this today.
2. tv. to get excited or angry. (An elaboration of work oneself up to something.) Now, now, don’t work yourself up into a lather.