…the maintenance of a constant difference in frequency between two or more connected circuits or components…
…follow the trail or movements of (someone or something), typically in order to find them or note their course…
…a technology that monitors eye movements as a means of detecting abnormalities or of studying how people interact with text or online documents…
…the practice of systematically recording information about one’s diet, health, or activities, typically by means of a smartphone, so as to discover behavioural patterns that may be adjusted to help improve one’s physical or mental well-being…
…a place from which the movements of missiles, aircraft, or satellites are tracked by radar or radio…
…cause (someone) to be distracted from an immediate or important issue…
…leave a trail of dirty footprints on a surface…
…leave a trail of dirt, debris, or snow from one’s feet…
…find someone or something after a thorough or difficult search…
