Definition of "deprecating"

Theodora, with a deprecating look at Arnold Sherman, took his arm, and Ludovic marched her across the green amid a silence which the very horses tied to the storm fence seemed to share. For Ludovic 'twas a crowded hour of glorious life.

1912, Lucy Maud Montgomery, Chronicles of Avonlea, Chapter I. The Hurrying of Ludovic, 7

It is now clear that the term Hobson-Jobson was originally a deprecating Anglo-Indian slang term for the Muharram used particularly in the army and merchant navy but also more widely.

2014, James Lambert, “A Much Tortured Expression: A New Look At `Hobson-Jobson'”, in International Journal of Lexicography, volume 27, number 1, page 67