bís, f. (gs. ~e, pl. ~eanna).1. Mec: Vice; screw. ~ bhinse, bench vice. ~ ordóige, thumb-screw. ~ shuite, set screw. Duine a chur faoi luí na ~e, to put the screws on s.o. Duine a choinneáil ar ~, to keep s.o. in suspense. Tá sé ar ~; tá ~ air (le rud éigin a dhéanamh), he is impatient (to do sth.). 2. Spiral. S.a. giar.