transitive verb
Definition 1
Literally or figuratively, cause (container, scale, etc.) to move from a horizontal or stable position; tilt, lean, unbalance.
Source: Invertext, from Concise Oxford Dictionary
Context: The aim [of the government's proposed reforms] is to tip the scales in favour of low-carbon forms of generation, including nuclear power, by making them more attractive to investors.
Source: Financial Times 14/02/2011 (David Blair, Energy Correspondent)