noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A form of Janney coupler, typically used on North American mainline passenger rail cars, having mechanical features that reduce slack in normal operation and prevent telescoping in derailments, yet remain compatible with other Janney types. attributive, often

Etymology

From tight + lock.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.