noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A counterweight on part of a machine.
2. 2
   A weight fixed to the trim tab of an aircraft that brings the nose down at low airspeeds (to avoid stalling).

Etymology

From bob + weight.

Related phrases

trim tab

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