noun - a vehicle that moves down an icy track at great speed; a winter sport in which teams race down an ice-covered track in a small, streamlined vehicle with runners
noun, American English - a vehicle that moves down an icy track at great speed; a winter sport in which teams race down an ice-covered track in a small, streamlined vehicle with runners
verb - to prepare or adjust something, especially a musical instrument, for optimal performance
verb - to make small adjustments to an engine or other mechanical device to ensure it is working properly and efficiently
noun, technical - a device or a part of a machine consisting of a bar or wheel with a set of angled teeth, allowing motion in one direction only, used in tools or mechanisms
noun - the tendency to emphasize or expect the worst possible outcome, or the belief that the negative aspects of life or events outweigh the positive ones
adjective - contaminated with harmful microorganisms, such as bacteria, viruses, or fungi, leading to disease or abnormal conditions