French-English translations for gaffer

blunder
us
to blunder in preparing a medical prescription
goof upIf I go near a skateboard, Im sure Im just going to goof up and fall off.I tried to fix it, but I think I just goofed it up some more.

misstepOn a high ledge, a misstep could be fatal.His comment was a misstep that could cost him dearly.My dance partner misstepped and landed on my toe.
screw uptrying to screw up enough courage to ask her outThe baby screwed up his face and began to bawl