A course of action, voluntarily entered into by at least the leading participant, which is (or appears) certain or very likely to result in death, failure, or defeat.

A trip made by walking. / A distance walked. / (sports) An Olympic Games track event requiring that the heel of the leading foot touch the ground before the toe of the trailing foot leaves the ground.

plural of eye drop

(biochemistry, pharmacology) A miotic alkaloid C₁₁H₁₆N₂O₂ obtained from jaborandi that is used chiefly in the form of its hydrochloride or nitrate especially in the treatment of glaucoma.